ssl/s3_clnt.c

   1 /* ssl/s3_clnt.c */
   2 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
   3  * All rights reserved.
   4  *
   5  * This package is an SSL implementation written
   6  * by Eric Young (eay@cryptsoft.com).
   7  * The implementation was written so as to conform with Netscapes SSL.
   8  *
   9  * This library is free for commercial and non-commercial use as long as
  10  * the following conditions are aheared to.  The following conditions
  11  * apply to all code found in this distribution, be it the RC4, RSA,
  12  * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
  13  * included with this distribution is covered by the same copyright terms
  14  * except that the holder is Tim Hudson (tjh@cryptsoft.com).
  15  *
  16  * Copyright remains Eric Young's, and as such any Copyright notices in
  17  * the code are not to be removed.
  18  * If this package is used in a product, Eric Young should be given attribution
  19  * as the author of the parts of the library used.
  20  * This can be in the form of a textual message at program startup or
  21  * in documentation (online or textual) provided with the package.
  22  *
  23  * Redistribution and use in source and binary forms, with or without
  24  * modification, are permitted provided that the following conditions
  25  * are met:
  26  * 1. Redistributions of source code must retain the copyright
  27  *    notice, this list of conditions and the following disclaimer.
  28  * 2. Redistributions in binary form must reproduce the above copyright
  29  *    notice, this list of conditions and the following disclaimer in the
  30  *    documentation and/or other materials provided with the distribution.
  31  * 3. All advertising materials mentioning features or use of this software
  32  *    must display the following acknowledgement:
  33  *    "This product includes cryptographic software written by
  34  *     Eric Young (eay@cryptsoft.com)"
  35  *    The word 'cryptographic' can be left out if the rouines from the library
  36  *    being used are not cryptographic related :-).
  37  * 4. If you include any Windows specific code (or a derivative thereof) from
  38  *    the apps directory (application code) you must include an acknowledgement:
  39  *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
  40  *
  41  * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
  42  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  43  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  44  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  45  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  46  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  47  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  48  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  49  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  50  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  51  * SUCH DAMAGE.
  52  *
  53  * The licence and distribution terms for any publically available version or
  54  * derivative of this code cannot be changed.  i.e. this code cannot simply be
  55  * copied and put under another distribution licence
  56  * [including the GNU Public Licence.]
  57  */
  58 /* ====================================================================
  59  * Copyright (c) 1998-2007 The OpenSSL Project.  All rights reserved.
  60  *
  61  * Redistribution and use in source and binary forms, with or without
  62  * modification, are permitted provided that the following conditions
  63  * are met:
  64  *
  65  * 1. Redistributions of source code must retain the above copyright
  66  *    notice, this list of conditions and the following disclaimer.
  67  *
  68  * 2. Redistributions in binary form must reproduce the above copyright
  69  *    notice, this list of conditions and the following disclaimer in
  70  *    the documentation and/or other materials provided with the
  71  *    distribution.
  72  *
  73  * 3. All advertising materials mentioning features or use of this
  74  *    software must display the following acknowledgment:
  75  *    "This product includes software developed by the OpenSSL Project
  76  *    for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
  77  *
  78  * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
  79  *    endorse or promote products derived from this software without
  80  *    prior written permission. For written permission, please contact
  81  *    openssl-core@openssl.org.
  82  *
  83  * 5. Products derived from this software may not be called "OpenSSL"
  84  *    nor may "OpenSSL" appear in their names without prior written
  85  *    permission of the OpenSSL Project.
  86  *
  87  * 6. Redistributions of any form whatsoever must retain the following
  88  *    acknowledgment:
  89  *    "This product includes software developed by the OpenSSL Project
  90  *    for use in the OpenSSL Toolkit (http://www.openssl.org/)"
  91  *
  92  * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
  93  * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  94  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  95  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
  96  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  97  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  98  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  99  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 100  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 101  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 102  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
 103  * OF THE POSSIBILITY OF SUCH DAMAGE.
 104  * ====================================================================
 105  *
 106  * This product includes cryptographic software written by Eric Young
 107  * (eay@cryptsoft.com).  This product includes software written by Tim
 108  * Hudson (tjh@cryptsoft.com).
 109  *
 110  */
 111 /* ====================================================================
 112  * Copyright 2002 Sun Microsystems, Inc. ALL RIGHTS RESERVED.
 113  *
 114  * Portions of the attached software ("Contribution") are developed by
 115  * SUN MICROSYSTEMS, INC., and are contributed to the OpenSSL project.
 116  *
 117  * The Contribution is licensed pursuant to the OpenSSL open source
 118  * license provided above.
 119  *
 120  * ECC cipher suite support in OpenSSL originally written by
 121  * Vipul Gupta and Sumit Gupta of Sun Microsystems Laboratories.
 122  *
 123  */
 124 /* ====================================================================
 125  * Copyright 2005 Nokia. All rights reserved.
 126  *
 127  * The portions of the attached software ("Contribution") is developed by
 128  * Nokia Corporation and is licensed pursuant to the OpenSSL open source
 129  * license.
 130  *
 131  * The Contribution, originally written by Mika Kousa and Pasi Eronen of
 132  * Nokia Corporation, consists of the "PSK" (Pre-Shared Key) ciphersuites
 133  * support (see RFC 4279) to OpenSSL.
 134  *
 135  * No patent licenses or other rights except those expressly stated in
 136  * the OpenSSL open source license shall be deemed granted or received
 137  * expressly, by implication, estoppel, or otherwise.
 138  *
 139  * No assurances are provided by Nokia that the Contribution does not
 140  * infringe the patent or other intellectual property rights of any third
 141  * party or that the license provides you with all the necessary rights
 142  * to make use of the Contribution.
 143  *
 144  * THE SOFTWARE IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND. IN
 145  * ADDITION TO THE DISCLAIMERS INCLUDED IN THE LICENSE, NOKIA
 146  * SPECIFICALLY DISCLAIMS ANY LIABILITY FOR CLAIMS BROUGHT BY YOU OR ANY
 147  * OTHER ENTITY BASED ON INFRINGEMENT OF INTELLECTUAL PROPERTY RIGHTS OR
 148  * OTHERWISE.
 149  */
 150
 151 #include <stdio.h>
 152 #include "ssl_locl.h"
 153 #include "kssl_lcl.h"
 154 #include <openssl/buffer.h>
 155 #include <openssl/rand.h>
 156 #include <openssl/objects.h>
 157 #include <openssl/evp.h>
 158 #include <openssl/md5.h>
 159 #ifdef OPENSSL_FIPS
 160 #include <openssl/fips.h>
 161 #endif
 162 #ifndef OPENSSL_NO_DH
 163 #include <openssl/dh.h>
 164 #endif
 165 #include <openssl/bn.h>
 166 #ifndef OPENSSL_NO_ENGINE
 167 #include <openssl/engine.h>
 168 #endif
 169
 170 static const SSL_METHOD *ssl3_get_client_method(int ver);
 171 static int ca_dn_cmp(const X509_NAME * const *a,const X509_NAME * const *b);
 172
 173 static const SSL_METHOD *ssl3_get_client_method(int ver)
 174         {
 175         if (ver == SSL3_VERSION)
 176                 return(SSLv3_client_method());
 177         else
 178                 return(NULL);
 179         }
 180
 181 IMPLEMENT_ssl3_meth_func(SSLv3_client_method,
 182                         ssl_undefined_function,
 183                         ssl3_connect,
 184                         ssl3_get_client_method)
 185
 186 int ssl3_connect(SSL *s)
 187         {
 188         BUF_MEM *buf=NULL;
 189         unsigned long Time=(unsigned long)time(NULL);
 190         void (*cb)(const SSL *ssl,int type,int val)=NULL;
 191         int ret= -1;
 192         int new_state,state,skip=0;
 193
 194         RAND_add(&Time,sizeof(Time),0);
 195         ERR_clear_error();
 196         clear_sys_error();
 197
 198         if (s->info_callback != NULL)
 199                 cb=s->info_callback;
 200         else if (s->ctx->info_callback != NULL)
 201                 cb=s->ctx->info_callback;
 202
 203         s->in_handshake++;
 204         if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s);
 205
 206 #ifndef OPENSSL_NO_HEARTBEATS
 207         /* If we're awaiting a HeartbeatResponse, pretend we
 208          * already got and don't await it anymore, because
 209          * Heartbeats don't make sense during handshakes anyway.
 210          */
 211         if (s->tlsext_hb_pending)
 212                 {
 213                 s->tlsext_hb_pending = 0;
 214                 s->tlsext_hb_seq++;
 215                 }
 216 #endif
 217
 218         for (;;)
 219                 {
 220                 state=s->state;
 221
 222                 switch(s->state)
 223                         {
 224                 case SSL_ST_RENEGOTIATE:
 225                         s->renegotiate=1;
 226                         s->state=SSL_ST_CONNECT;
 227                         s->ctx->stats.sess_connect_renegotiate++;
 228                         /* break */
 229                 case SSL_ST_BEFORE:
 230                 case SSL_ST_CONNECT:
 231                 case SSL_ST_BEFORE|SSL_ST_CONNECT:
 232                 case SSL_ST_OK|SSL_ST_CONNECT:
 233
 234                         s->server=0;
 235                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);
 236
 237                         if ((s->version & 0xff00 ) != 0x0300)
 238                                 {
 239                                 SSLerr(SSL_F_SSL3_CONNECT, ERR_R_INTERNAL_ERROR);
 240                                 ret = -1;
 241                                 goto end;
 242                                 }
 243
 244                         /* s->version=SSL3_VERSION; */
 245                         s->type=SSL_ST_CONNECT;
 246
 247                         if (s->init_buf == NULL)
 248                                 {
 249                                 if ((buf=BUF_MEM_new()) == NULL)
 250                                         {
 251                                         ret= -1;
 252                                         goto end;
 253                                         }
 254                                 if (!BUF_MEM_grow(buf,SSL3_RT_MAX_PLAIN_LENGTH))
 255                                         {
 256                                         ret= -1;
 257                                         goto end;
 258                                         }
 259                                 s->init_buf=buf;
 260                                 buf=NULL;
 261                                 }
 262
 263                         if (!ssl3_setup_buffers(s)) { ret= -1; goto end; }
 264
 265                         /* setup buffing BIO */
 266                         if (!ssl_init_wbio_buffer(s,0)) { ret= -1; goto end; }
 267
 268                         /* don't push the buffering BIO quite yet */
 269
 270                         ssl3_init_finished_mac(s);
 271
 272                         s->state=SSL3_ST_CW_CLNT_HELLO_A;
 273                         s->ctx->stats.sess_connect++;
 274                         s->init_num=0;
 275                         break;
 276
 277                 case SSL3_ST_CW_CLNT_HELLO_A:
 278                 case SSL3_ST_CW_CLNT_HELLO_B:
 279
 280                         s->shutdown=0;
 281                         ret=ssl3_client_hello(s);
 282                         if (ret <= 0) goto end;
 283                         s->state=SSL3_ST_CR_SRVR_HELLO_A;
 284                         s->init_num=0;
 285
 286                         /* turn on buffering for the next lot of output */
 287                         if (s->bbio != s->wbio)
 288                                 s->wbio=BIO_push(s->bbio,s->wbio);
 289
 290                         break;
 291
 292                 case SSL3_ST_CR_SRVR_HELLO_A:
 293                 case SSL3_ST_CR_SRVR_HELLO_B:
 294                         ret=ssl3_get_server_hello(s);
 295                         if (ret <= 0) goto end;
 296
 297                         if (s->hit)
 298                                 {
 299                                 s->state=SSL3_ST_CR_FINISHED_A;
 300 #ifndef OPENSSL_NO_TLSEXT
 301                                 if (s->tlsext_ticket_expected)
 302                                         {
 303                                         /* receive renewed session ticket */
 304                                         s->state=SSL3_ST_CR_SESSION_TICKET_A;
 305                                         }
 306 #endif
 307                                 }
 308                         else
 309                                 {
 310                                         s->state=SSL3_ST_CR_CERT_A;
 311                                 }
 312                         s->init_num=0;
 313                         break;
 314                 case SSL3_ST_CR_CERT_A:
 315                 case SSL3_ST_CR_CERT_B:
 316 #ifndef OPENSSL_NO_TLSEXT
 317                         ret=ssl3_check_finished(s);
 318                         if (ret <= 0) goto end;
 319                         if (ret == 2)
 320                                 {
 321                                 s->hit = 1;
 322                                 if (s->tlsext_ticket_expected)
 323                                         s->state=SSL3_ST_CR_SESSION_TICKET_A;
 324                                 else
 325                                         s->state=SSL3_ST_CR_FINISHED_A;
 326                                 s->init_num=0;
 327                                 break;
 328                                 }
 329 #endif
 330                         /* Check if it is anon DH/ECDH, SRP auth */
 331                         /* or PSK */
 332                         if (!(s->s3->tmp.new_cipher->algorithm_auth & (SSL_aNULL|SSL_aSRP)) &&
 333                             !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK))
 334                                 {
 335                                 ret=ssl3_get_server_certificate(s);
 336                                 if (ret <= 0) goto end;
 337 #ifndef OPENSSL_NO_TLSEXT
 338                                 if (s->tlsext_status_expected)
 339                                         s->state=SSL3_ST_CR_CERT_STATUS_A;
 340                                 else
 341                                         s->state=SSL3_ST_CR_KEY_EXCH_A;
 342                                 }
 343                         else
 344                                 {
 345                                 skip = 1;
 346                                 s->state=SSL3_ST_CR_KEY_EXCH_A;
 347                                 }
 348 #else
 349                                 }
 350                         else
 351                                 skip=1;
 352
 353                         s->state=SSL3_ST_CR_KEY_EXCH_A;
 354 #endif
 355                         s->init_num=0;
 356                         break;
 357
 358                 case SSL3_ST_CR_KEY_EXCH_A:
 359                 case SSL3_ST_CR_KEY_EXCH_B:
 360                         ret=ssl3_get_key_exchange(s);
 361                         if (ret <= 0) goto end;
 362                         s->state=SSL3_ST_CR_CERT_REQ_A;
 363                         s->init_num=0;
 364
 365                         /* at this point we check that we have the
 366                          * required stuff from the server */
 367                         if (!ssl3_check_cert_and_algorithm(s))
 368                                 {
 369                                 ret= -1;
 370                                 goto end;
 371                                 }
 372                         break;
 373
 374                 case SSL3_ST_CR_CERT_REQ_A:
 375                 case SSL3_ST_CR_CERT_REQ_B:
 376                         ret=ssl3_get_certificate_request(s);
 377                         if (ret <= 0) goto end;
 378                         s->state=SSL3_ST_CR_SRVR_DONE_A;
 379                         s->init_num=0;
 380                         break;
 381
 382                 case SSL3_ST_CR_SRVR_DONE_A:
 383                 case SSL3_ST_CR_SRVR_DONE_B:
 384                         ret=ssl3_get_server_done(s);
 385                         if (ret <= 0) goto end;
 386 #ifndef OPENSSL_NO_SRP
 387                         if (s->s3->tmp.new_cipher->algorithm_mkey & SSL_kSRP)
 388                                 {
 389                                 if ((ret = SRP_Calc_A_param(s))<=0)
 390                                         {
 391                                         SSLerr(SSL_F_SSL3_CONNECT,SSL_R_SRP_A_CALC);
 392                                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_INTERNAL_ERROR);
 393                                         goto end;
 394                                         }
 395                                 }
 396 #endif
 397                         if (s->s3->tmp.cert_req)
 398                                 s->state=SSL3_ST_CW_CERT_A;
 399                         else
 400                                 s->state=SSL3_ST_CW_KEY_EXCH_A;
 401                         s->init_num=0;
 402
 403                         break;
 404
 405                 case SSL3_ST_CW_CERT_A:
 406                 case SSL3_ST_CW_CERT_B:
 407                 case SSL3_ST_CW_CERT_C:
 408                 case SSL3_ST_CW_CERT_D:
 409                         ret=ssl3_send_client_certificate(s);
 410                         if (ret <= 0) goto end;
 411                         s->state=SSL3_ST_CW_KEY_EXCH_A;
 412                         s->init_num=0;
 413                         break;
 414
 415                 case SSL3_ST_CW_KEY_EXCH_A:
 416                 case SSL3_ST_CW_KEY_EXCH_B:
 417                         ret=ssl3_send_client_key_exchange(s);
 418                         if (ret <= 0) goto end;
 419                         /* EAY EAY EAY need to check for DH fix cert
 420                          * sent back */
 421                         /* For TLS, cert_req is set to 2, so a cert chain
 422                          * of nothing is sent, but no verify packet is sent */
 423                         /* XXX: For now, we do not support client
 424                          * authentication in ECDH cipher suites with
 425                          * ECDH (rather than ECDSA) certificates.
 426                          * We need to skip the certificate verify
 427                          * message when client's ECDH public key is sent
 428                          * inside the client certificate.
 429                          */
 430                         if (s->s3->tmp.cert_req == 1)
 431                                 {
 432                                 s->state=SSL3_ST_CW_CERT_VRFY_A;
 433                                 }
 434                         else
 435                                 {
 436                                 s->state=SSL3_ST_CW_CHANGE_A;
 437                                 s->s3->change_cipher_spec=0;
 438                                 }
 439                         if (s->s3->flags & TLS1_FLAGS_SKIP_CERT_VERIFY)
 440                                 {
 441                                 s->state=SSL3_ST_CW_CHANGE_A;
 442                                 s->s3->change_cipher_spec=0;
 443                                 }
 444
 445                         s->init_num=0;
 446                         break;
 447
 448                 case SSL3_ST_CW_CERT_VRFY_A:
 449                 case SSL3_ST_CW_CERT_VRFY_B:
 450                         ret=ssl3_send_client_verify(s);
 451                         if (ret <= 0) goto end;
 452                         s->state=SSL3_ST_CW_CHANGE_A;
 453                         s->init_num=0;
 454                         s->s3->change_cipher_spec=0;
 455                         break;
 456
 457                 case SSL3_ST_CW_CHANGE_A:
 458                 case SSL3_ST_CW_CHANGE_B:
 459                         ret=ssl3_send_change_cipher_spec(s,
 460                                 SSL3_ST_CW_CHANGE_A,SSL3_ST_CW_CHANGE_B);
 461                         if (ret <= 0) goto end;
 462
 463 #if defined(OPENSSL_NO_TLSEXT) || defined(OPENSSL_NO_NEXTPROTONEG)
 464                         s->state=SSL3_ST_CW_FINISHED_A;
 465 #else
 466                         if (s->s3->next_proto_neg_seen)
 467                                 s->state=SSL3_ST_CW_NEXT_PROTO_A;
 468                         else
 469                                 s->state=SSL3_ST_CW_FINISHED_A;
 470 #endif
 471                         s->init_num=0;
 472
 473                         s->session->cipher=s->s3->tmp.new_cipher;
 474 #ifdef OPENSSL_NO_COMP
 475                         s->session->compress_meth=0;
 476 #else
 477                         if (s->s3->tmp.new_compression == NULL)
 478                                 s->session->compress_meth=0;
 479                         else
 480                                 s->session->compress_meth=
 481                                         s->s3->tmp.new_compression->id;
 482 #endif
 483                         if (!s->method->ssl3_enc->setup_key_block(s))
 484                                 {
 485                                 ret= -1;
 486                                 goto end;
 487                                 }
 488
 489                         if (!s->method->ssl3_enc->change_cipher_state(s,
 490                                 SSL3_CHANGE_CIPHER_CLIENT_WRITE))
 491                                 {
 492                                 ret= -1;
 493                                 goto end;
 494                                 }
 495
 496                         break;
 497
 498 #if !defined(OPENSSL_NO_TLSEXT) && !defined(OPENSSL_NO_NEXTPROTONEG)
 499                 case SSL3_ST_CW_NEXT_PROTO_A:
 500                 case SSL3_ST_CW_NEXT_PROTO_B:
 501                         ret=ssl3_send_next_proto(s);
 502                         if (ret <= 0) goto end;
 503                         s->state=SSL3_ST_CW_FINISHED_A;
 504                         break;
 505 #endif
 506
 507                 case SSL3_ST_CW_FINISHED_A:
 508                 case SSL3_ST_CW_FINISHED_B:
 509                         ret=ssl3_send_finished(s,
 510                                 SSL3_ST_CW_FINISHED_A,SSL3_ST_CW_FINISHED_B,
 511                                 s->method->ssl3_enc->client_finished_label,
 512                                 s->method->ssl3_enc->client_finished_label_len);
 513                         if (ret <= 0) goto end;
 514                         s->s3->flags |= SSL3_FLAGS_CCS_OK;
 515                         s->state=SSL3_ST_CW_FLUSH;
 516
 517                         /* clear flags */
 518                         s->s3->flags&= ~SSL3_FLAGS_POP_BUFFER;
 519                         if (s->hit)
 520                                 {
 521                                 s->s3->tmp.next_state=SSL_ST_OK;
 522                                 if (s->s3->flags & SSL3_FLAGS_DELAY_CLIENT_FINISHED)
 523                                         {
 524                                         s->state=SSL_ST_OK;
 525                                         s->s3->flags|=SSL3_FLAGS_POP_BUFFER;
 526                                         s->s3->delay_buf_pop_ret=0;
 527                                         }
 528                                 }
 529                         else
 530                                 {
 531 #ifndef OPENSSL_NO_TLSEXT
 532                                 /* Allow NewSessionTicket if ticket expected */
 533                                 if (s->tlsext_ticket_expected)
 534                                         s->s3->tmp.next_state=SSL3_ST_CR_SESSION_TICKET_A;
 535                                 else
 536 #endif
 537
 538                                 s->s3->tmp.next_state=SSL3_ST_CR_FINISHED_A;
 539                                 }
 540                         s->init_num=0;
 541                         break;
 542
 543 #ifndef OPENSSL_NO_TLSEXT
 544                 case SSL3_ST_CR_SESSION_TICKET_A:
 545                 case SSL3_ST_CR_SESSION_TICKET_B:
 546                         ret=ssl3_get_new_session_ticket(s);
 547                         if (ret <= 0) goto end;
 548                         s->state=SSL3_ST_CR_FINISHED_A;
 549                         s->init_num=0;
 550                 break;
 551
 552                 case SSL3_ST_CR_CERT_STATUS_A:
 553                 case SSL3_ST_CR_CERT_STATUS_B:
 554                         ret=ssl3_get_cert_status(s);
 555                         if (ret <= 0) goto end;
 556                         s->state=SSL3_ST_CR_KEY_EXCH_A;
 557                         s->init_num=0;
 558                 break;
 559 #endif
 560
 561                 case SSL3_ST_CR_FINISHED_A:
 562                 case SSL3_ST_CR_FINISHED_B:
 563
 564                         s->s3->flags |= SSL3_FLAGS_CCS_OK;
 565                         ret=ssl3_get_finished(s,SSL3_ST_CR_FINISHED_A,
 566                                 SSL3_ST_CR_FINISHED_B);
 567                         if (ret <= 0) goto end;
 568
 569                         if (s->hit)
 570                                 s->state=SSL3_ST_CW_CHANGE_A;
 571                         else
 572                                 s->state=SSL_ST_OK;
 573                         s->init_num=0;
 574                         break;
 575
 576                 case SSL3_ST_CW_FLUSH:
 577                         s->rwstate=SSL_WRITING;
 578                         if (BIO_flush(s->wbio) <= 0)
 579                                 {
 580                                 ret= -1;
 581                                 goto end;
 582                                 }
 583                         s->rwstate=SSL_NOTHING;
 584                         s->state=s->s3->tmp.next_state;
 585                         break;
 586
 587                 case SSL_ST_OK:
 588                         /* clean a few things up */
 589                         ssl3_cleanup_key_block(s);
 590
 591                         if (s->init_buf != NULL)
 592                                 {
 593                                 BUF_MEM_free(s->init_buf);
 594                                 s->init_buf=NULL;
 595                                 }
 596
 597                         /* If we are not 'joining' the last two packets,
 598                          * remove the buffering now */
 599                         if (!(s->s3->flags & SSL3_FLAGS_POP_BUFFER))
 600                                 ssl_free_wbio_buffer(s);
 601                         /* else do it later in ssl3_write */
 602
 603                         s->init_num=0;
 604                         s->renegotiate=0;
 605                         s->new_session=0;
 606
 607                         ssl_update_cache(s,SSL_SESS_CACHE_CLIENT);
 608                         if (s->hit) s->ctx->stats.sess_hit++;
 609
 610                         ret=1;
 611                         /* s->server=0; */
 612                         s->handshake_func=ssl3_connect;
 613                         s->ctx->stats.sess_connect_good++;
 614
 615                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
 616
 617                         goto end;
 618                         /* break; */
 619
 620                 default:
 621                         SSLerr(SSL_F_SSL3_CONNECT,SSL_R_UNKNOWN_STATE);
 622                         ret= -1;
 623                         goto end;
 624                         /* break; */
 625                         }
 626
 627                 /* did we do anything */
 628                 if (!s->s3->tmp.reuse_message && !skip)
 629                         {
 630                         if (s->debug)
 631                                 {
 632                                 if ((ret=BIO_flush(s->wbio)) <= 0)
 633                                         goto end;
 634                                 }
 635
 636                         if ((cb != NULL) && (s->state != state))
 637                                 {
 638                                 new_state=s->state;
 639                                 s->state=state;
 640                                 cb(s,SSL_CB_CONNECT_LOOP,1);
 641                                 s->state=new_state;
 642                                 }
 643                         }
 644                 skip=0;
 645                 }
 646 end:
 647         s->in_handshake--;
 648         if (buf != NULL)
 649                 BUF_MEM_free(buf);
 650         if (cb != NULL)
 651                 cb(s,SSL_CB_CONNECT_EXIT,ret);
 652         return(ret);
 653         }
 654
 655
 656 int ssl3_client_hello(SSL *s)
 657         {
 658         unsigned char *buf;
 659         unsigned char *p,*d;
 660         int i;
 661         unsigned long l;
 662         int al = 0;
 663 #ifndef OPENSSL_NO_COMP
 664         int j;
 665         SSL_COMP *comp;
 666 #endif
 667
 668         buf=(unsigned char *)s->init_buf->data;
 669         if (s->state == SSL3_ST_CW_CLNT_HELLO_A)
 670                 {
 671                 SSL_SESSION *sess = s->session;
 672                 if ((sess == NULL) ||
 673                         (sess->ssl_version != s->version) ||
 674 #ifdef OPENSSL_NO_TLSEXT
 675                         !sess->session_id_length ||
 676 #else
 677                         (!sess->session_id_length && !sess->tlsext_tick) ||
 678 #endif
 679                         (sess->not_resumable))
 680                         {
 681                         if (!ssl_get_new_session(s,0))
 682                                 goto err;
 683                         }
 684                 if (s->method->version == DTLS_ANY_VERSION)
 685                         {
 686                         /* Determine which DTLS version to use */
 687                         int options = s->options;
 688                         /* If DTLS 1.2 disabled correct the version number */
 689                         if (options & SSL_OP_NO_DTLSv1_2)
 690                                 {
 691                                 if (tls1_suiteb(s))
 692                                         {
 693                                         SSLerr(SSL_F_SSL3_CLIENT_HELLO, SSL_R_ONLY_DTLS_1_2_ALLOWED_IN_SUITEB_MODE);
 694                                         goto err;
 695                                         }
 696                                 /* Disabling all versions is silly: return an
 697                                  * error.
 698                                  */
 699                                 if (options & SSL_OP_NO_DTLSv1)
 700                                         {
 701                                         SSLerr(SSL_F_SSL3_CLIENT_HELLO,SSL_R_WRONG_SSL_VERSION);
 702                                         goto err;
 703                                         }
 704                                 /* Update method so we don't use any DTLS 1.2
 705                                  * features.
 706                                  */
 707                                 s->method = DTLSv1_client_method();
 708                                 s->version = DTLS1_VERSION;
 709                                 }
 710                         else
 711                                 {
 712                                 /* We only support one version: update method */
 713                                 if (options & SSL_OP_NO_DTLSv1)
 714                                         s->method = DTLSv1_2_client_method();
 715                                 s->version = DTLS1_2_VERSION;
 716                                 }
 717                         s->client_version = s->version;
 718                         }
 719                 /* else use the pre-loaded session */
 720
 721                 p=s->s3->client_random;
 722
 723                 /* for DTLS if client_random is initialized, reuse it, we are
 724                  * required to use same upon reply to HelloVerify */
 725                 if (SSL_IS_DTLS(s))
 726                         {
 727                         size_t idx;
 728                         i = 1;
 729                         for (idx=0; idx < sizeof(s->s3->client_random); idx++)
 730                                 {
 731                                 if (p[idx])
 732                                         {
 733                                         i = 0;
 734                                         break;
 735                                         }
 736                                 }
 737                         }
 738                 else
 739                         i = 1;
 740
 741                 if (i)
 742                         ssl_fill_hello_random(s, 0, p,
 743                                               sizeof(s->s3->client_random));
 744
 745                 /* Do the message type and length last */
 746                 d=p= ssl_handshake_start(s);
 747
 748                 /* version indicates the negotiated version: for example from
 749                  * an SSLv2/v3 compatible client hello). The client_version
 750                  * field is the maximum version we permit and it is also
 751                  * used in RSA encrypted premaster secrets. Some servers can
 752                  * choke if we initially report a higher version then
 753                  * renegotiate to a lower one in the premaster secret. This
 754                  * didn't happen with TLS 1.0 as most servers supported it
 755                  * but it can with TLS 1.1 or later if the server only supports
 756                  * 1.0.
 757                  *
 758                  * Possible scenario with previous logic:
 759                  *      1. Client hello indicates TLS 1.2
 760                  *      2. Server hello says TLS 1.0
 761                  *      3. RSA encrypted premaster secret uses 1.2.
 762                  *      4. Handhaked proceeds using TLS 1.0.
 763                  *      5. Server sends hello request to renegotiate.
 764                  *      6. Client hello indicates TLS v1.0 as we now
 765                  *         know that is maximum server supports.
 766                  *      7. Server chokes on RSA encrypted premaster secret
 767                  *         containing version 1.0.
 768                  *
 769                  * For interoperability it should be OK to always use the
 770                  * maximum version we support in client hello and then rely
 771                  * on the checking of version to ensure the servers isn't
 772                  * being inconsistent: for example initially negotiating with
 773                  * TLS 1.0 and renegotiating with TLS 1.2. We do this by using
 774                  * client_version in client hello and not resetting it to
 775                  * the negotiated version.
 776                  */
 777 #if 0
 778                 *(p++)=s->version>>8;
 779                 *(p++)=s->version&0xff;
 780                 s->client_version=s->version;
 781 #else
 782                 *(p++)=s->client_version>>8;
 783                 *(p++)=s->client_version&0xff;
 784 #endif
 785
 786                 /* Random stuff */
 787                 memcpy(p,s->s3->client_random,SSL3_RANDOM_SIZE);
 788                 p+=SSL3_RANDOM_SIZE;
 789
 790                 /* Session ID */
 791                 if (s->new_session)
 792                         i=0;
 793                 else
 794                         i=s->session->session_id_length;
 795                 *(p++)=i;
 796                 if (i != 0)
 797                         {
 798                         if (i > (int)sizeof(s->session->session_id))
 799                                 {
 800                                 SSLerr(SSL_F_SSL3_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);
 801                                 goto err;
 802                                 }
 803                         memcpy(p,s->session->session_id,i);
 804                         p+=i;
 805                         }
 806
 807                 /* cookie stuff for DTLS */
 808                 if (SSL_IS_DTLS(s))
 809                         {
 810                         if ( s->d1->cookie_len > sizeof(s->d1->cookie))
 811                                 {
 812                                 SSLerr(SSL_F_SSL3_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);
 813                                 goto err;
 814                                 }
 815                         *(p++) = s->d1->cookie_len;
 816                         memcpy(p, s->d1->cookie, s->d1->cookie_len);
 817                         p += s->d1->cookie_len;
 818                         }
 819
 820                 /* Ciphers supported */
 821                 i=ssl_cipher_list_to_bytes(s,SSL_get_ciphers(s),&(p[2]),0);
 822                 if (i == 0)
 823                         {
 824                         SSLerr(SSL_F_SSL3_CLIENT_HELLO,SSL_R_NO_CIPHERS_AVAILABLE);
 825                         goto err;
 826                         }
 827 #ifdef OPENSSL_MAX_TLS1_2_CIPHER_LENGTH
 828                         /* Some servers hang if client hello > 256 bytes
 829                          * as hack workaround chop number of supported ciphers
 830                          * to keep it well below this if we use TLS v1.2
 831                          */
 832                         if (TLS1_get_version(s) >= TLS1_2_VERSION
 833                                 && i > OPENSSL_MAX_TLS1_2_CIPHER_LENGTH)
 834                                 i = OPENSSL_MAX_TLS1_2_CIPHER_LENGTH & ~1;
 835 #endif
 836                 s2n(i,p);
 837                 p+=i;
 838
 839                 /* COMPRESSION */
 840 #ifdef OPENSSL_NO_COMP
 841                 *(p++)=1;
 842 #else
 843
 844                 if ((s->options & SSL_OP_NO_COMPRESSION)
 845                                         || !s->ctx->comp_methods)
 846                         j=0;
 847                 else
 848                         j=sk_SSL_COMP_num(s->ctx->comp_methods);
 849                 *(p++)=1+j;
 850                 for (i=0; i<j; i++)
 851                         {
 852                         comp=sk_SSL_COMP_value(s->ctx->comp_methods,i);
 853                         *(p++)=comp->id;
 854                         }
 855 #endif
 856                 *(p++)=0; /* Add the NULL method */
 857
 858 #ifndef OPENSSL_NO_TLSEXT
 859                 /* TLS extensions*/
 860                 if (ssl_prepare_clienthello_tlsext(s) <= 0)
 861                         {
 862                         SSLerr(SSL_F_SSL3_CLIENT_HELLO,SSL_R_CLIENTHELLO_TLSEXT);
 863                         goto err;
 864                         }
 865                 if ((p = ssl_add_clienthello_tlsext(s, p, buf+SSL3_RT_MAX_PLAIN_LENGTH, &al)) == NULL)
 866                         {
 867                         ssl3_send_alert(s,SSL3_AL_FATAL,al);
 868                         SSLerr(SSL_F_SSL3_CLIENT_HELLO,ERR_R_INTERNAL_ERROR);
 869                         goto err;
 870                         }
 871 #endif
 872
 873                 l= p-d;
 874                 ssl_set_handshake_header(s, SSL3_MT_CLIENT_HELLO, l);
 875                 s->state=SSL3_ST_CW_CLNT_HELLO_B;
 876                 }
 877
 878         /* SSL3_ST_CW_CLNT_HELLO_B */
 879         return ssl_do_write(s);
 880 err:
 881         return(-1);
 882         }
 883
 884 int ssl3_get_server_hello(SSL *s)
 885         {
 886         STACK_OF(SSL_CIPHER) *sk;
 887         const SSL_CIPHER *c;
 888         CERT *ct = s->cert;
 889         unsigned char *p,*d;
 890         int i,al=SSL_AD_INTERNAL_ERROR,ok;
 891         unsigned int j;
 892         long n;
 893 #ifndef OPENSSL_NO_COMP
 894         SSL_COMP *comp;
 895 #endif
 896         /* Hello verify request and/or server hello version may not
 897          * match so set first packet if we're negotiating version.
 898          */
 899         if (SSL_IS_DTLS(s))
 900                 s->first_packet = 1;
 901
 902         n=s->method->ssl_get_message(s,
 903                 SSL3_ST_CR_SRVR_HELLO_A,
 904                 SSL3_ST_CR_SRVR_HELLO_B,
 905                 -1,
 906                 20000, /* ?? */
 907                 &ok);
 908
 909         if (!ok) return((int)n);
 910
 911         if (SSL_IS_DTLS(s))
 912                 {
 913                 s->first_packet = 0;
 914                 if ( s->s3->tmp.message_type == DTLS1_MT_HELLO_VERIFY_REQUEST)
 915                         {
 916                         if ( s->d1->send_cookie == 0)
 917                                 {
 918                                 s->s3->tmp.reuse_message = 1;
 919                                 return 1;
 920                                 }
 921                         else /* already sent a cookie */
 922                                 {
 923                                 al=SSL_AD_UNEXPECTED_MESSAGE;
 924                                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_BAD_MESSAGE_TYPE);
 925                                 goto f_err;
 926                                 }
 927                         }
 928                 }
 929
 930         if ( s->s3->tmp.message_type != SSL3_MT_SERVER_HELLO)
 931                 {
 932                 al=SSL_AD_UNEXPECTED_MESSAGE;
 933                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_BAD_MESSAGE_TYPE);
 934                 goto f_err;
 935                 }
 936
 937         d=p=(unsigned char *)s->init_msg;
 938         if (s->method->version == DTLS_ANY_VERSION)
 939                 {
 940                 /* Work out correct protocol version to use */
 941                 int hversion = (p[0] << 8)|p[1];
 942                 int options = s->options;
 943                 if (hversion == DTLS1_2_VERSION
 944                         && !(options & SSL_OP_NO_DTLSv1_2))
 945                         s->method = DTLSv1_2_client_method();
 946                 else if (tls1_suiteb(s))
 947                         {
 948                         SSLerr(SSL_F_SSL3_GET_SERVER_HELLO, SSL_R_ONLY_DTLS_1_2_ALLOWED_IN_SUITEB_MODE);
 949                         s->version = hversion;
 950                         al = SSL_AD_PROTOCOL_VERSION;
 951                         goto f_err;
 952                         }
 953                 else if (hversion == DTLS1_VERSION
 954                         && !(options & SSL_OP_NO_DTLSv1))
 955                         s->method = DTLSv1_client_method();
 956                 else
 957                         {
 958                         SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_WRONG_SSL_VERSION);
 959                         s->version = hversion;
 960                         al = SSL_AD_PROTOCOL_VERSION;
 961                         goto f_err;
 962                         }
 963                 s->version = s->client_version = s->method->version;
 964                 }
 965
 966         if ((p[0] != (s->version>>8)) || (p[1] != (s->version&0xff)))
 967                 {
 968                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_WRONG_SSL_VERSION);
 969                 s->version=(s->version&0xff00)|p[1];
 970                 al=SSL_AD_PROTOCOL_VERSION;
 971                 goto f_err;
 972                 }
 973         p+=2;
 974
 975         /* load the server hello data */
 976         /* load the server random */
 977         memcpy(s->s3->server_random,p,SSL3_RANDOM_SIZE);
 978         p+=SSL3_RANDOM_SIZE;
 979
 980         /* get the session-id */
 981         j= *(p++);
 982
 983         if ((j > sizeof s->session->session_id) || (j > SSL3_SESSION_ID_SIZE))
 984                 {
 985                 al=SSL_AD_ILLEGAL_PARAMETER;
 986                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_SSL3_SESSION_ID_TOO_LONG);
 987                 goto f_err;
 988                 }
 989
 990 #ifndef OPENSSL_NO_TLSEXT
 991         /* check if we want to resume the session based on external pre-shared secret */
 992         if (s->version >= TLS1_VERSION && s->tls_session_secret_cb)
 993                 {
 994                 SSL_CIPHER *pref_cipher=NULL;
 995                 s->session->master_key_length=sizeof(s->session->master_key);
 996                 if (s->tls_session_secret_cb(s, s->session->master_key,
 997                                              &s->session->master_key_length,
 998                                              NULL, &pref_cipher,
 999                                              s->tls_session_secret_cb_arg))
1000                         {
1001                         s->session->cipher = pref_cipher ?
1002                                 pref_cipher : ssl_get_cipher_by_char(s, p+j);
1003                         s->s3->flags |= SSL3_FLAGS_CCS_OK;
1004                         }
1005                 }
1006 #endif /* OPENSSL_NO_TLSEXT */
1007
1008         if (j != 0 && j == s->session->session_id_length
1009             && memcmp(p,s->session->session_id,j) == 0)
1010             {
1011             if(s->sid_ctx_length != s->session->sid_ctx_length
1012                || memcmp(s->session->sid_ctx,s->sid_ctx,s->sid_ctx_length))
1013                 {
1014                 /* actually a client application bug */
1015                 al=SSL_AD_ILLEGAL_PARAMETER;
1016                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_ATTEMPT_TO_REUSE_SESSION_IN_DIFFERENT_CONTEXT);
1017                 goto f_err;
1018                 }
1019             s->s3->flags |= SSL3_FLAGS_CCS_OK;
1020             s->hit=1;
1021             }
1022         else    /* a miss or crap from the other end */
1023                 {
1024                 /* If we were trying for session-id reuse, make a new
1025                  * SSL_SESSION so we don't stuff up other people */
1026                 s->hit=0;
1027                 if (s->session->session_id_length > 0)
1028                         {
1029                         if (!ssl_get_new_session(s,0))
1030                                 {
1031                                 goto f_err;
1032                                 }
1033                         }
1034                 s->session->session_id_length=j;
1035                 memcpy(s->session->session_id,p,j); /* j could be 0 */
1036                 }
1037         p+=j;
1038         c=ssl_get_cipher_by_char(s,p);
1039         if (c == NULL)
1040                 {
1041                 /* unknown cipher */
1042                 al=SSL_AD_ILLEGAL_PARAMETER;
1043                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_UNKNOWN_CIPHER_RETURNED);
1044                 goto f_err;
1045                 }
1046         /* If it is a disabled cipher we didn't send it in client hello,
1047          * so return an error.
1048          */
1049         if (c->algorithm_ssl & ct->mask_ssl ||
1050                 c->algorithm_mkey & ct->mask_k ||
1051                 c->algorithm_auth & ct->mask_a)
1052                 {
1053                 al=SSL_AD_ILLEGAL_PARAMETER;
1054                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_WRONG_CIPHER_RETURNED);
1055                 goto f_err;
1056                 }
1057         p+=ssl_put_cipher_by_char(s,NULL,NULL);
1058
1059         sk=ssl_get_ciphers_by_id(s);
1060         i=sk_SSL_CIPHER_find(sk,c);
1061         if (i < 0)
1062                 {
1063                 /* we did not say we would use this cipher */
1064                 al=SSL_AD_ILLEGAL_PARAMETER;
1065                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_WRONG_CIPHER_RETURNED);
1066                 goto f_err;
1067                 }
1068
1069         /* Depending on the session caching (internal/external), the cipher
1070            and/or cipher_id values may not be set. Make sure that
1071            cipher_id is set and use it for comparison. */
1072         if (s->session->cipher)
1073                 s->session->cipher_id = s->session->cipher->id;
1074         if (s->hit && (s->session->cipher_id != c->id))
1075                 {
1076 /* Workaround is now obsolete */
1077 #if 0
1078                 if (!(s->options &
1079                         SSL_OP_NETSCAPE_REUSE_CIPHER_CHANGE_BUG))
1080 #endif
1081                         {
1082                         al=SSL_AD_ILLEGAL_PARAMETER;
1083                         SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_OLD_SESSION_CIPHER_NOT_RETURNED);
1084                         goto f_err;
1085                         }
1086                 }
1087         s->s3->tmp.new_cipher=c;
1088         /* Don't digest cached records if no sigalgs: we may need them for
1089          * client authentication.
1090          */
1091         if (!SSL_USE_SIGALGS(s) && !ssl3_digest_cached_records(s))
1092                 goto f_err;
1093         /* lets get the compression algorithm */
1094         /* COMPRESSION */
1095 #ifdef OPENSSL_NO_COMP
1096         if (*(p++) != 0)
1097                 {
1098                 al=SSL_AD_ILLEGAL_PARAMETER;
1099                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_UNSUPPORTED_COMPRESSION_ALGORITHM);
1100                 goto f_err;
1101                 }
1102         /* If compression is disabled we'd better not try to resume a session
1103          * using compression.
1104          */
1105         if (s->session->compress_meth != 0)
1106                 {
1107                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_INCONSISTENT_COMPRESSION);
1108                 goto f_err;
1109                 }
1110 #else
1111         j= *(p++);
1112         if (s->hit && j != s->session->compress_meth)
1113                 {
1114                 al=SSL_AD_ILLEGAL_PARAMETER;
1115                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_OLD_SESSION_COMPRESSION_ALGORITHM_NOT_RETURNED);
1116                 goto f_err;
1117                 }
1118         if (j == 0)
1119                 comp=NULL;
1120         else if (s->options & SSL_OP_NO_COMPRESSION)
1121                 {
1122                 al=SSL_AD_ILLEGAL_PARAMETER;
1123                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_COMPRESSION_DISABLED);
1124                 goto f_err;
1125                 }
1126         else
1127                 comp=ssl3_comp_find(s->ctx->comp_methods,j);
1128
1129         if ((j != 0) && (comp == NULL))
1130                 {
1131                 al=SSL_AD_ILLEGAL_PARAMETER;
1132                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_UNSUPPORTED_COMPRESSION_ALGORITHM);
1133                 goto f_err;
1134                 }
1135         else
1136                 {
1137                 s->s3->tmp.new_compression=comp;
1138                 }
1139 #endif
1140
1141 #ifndef OPENSSL_NO_TLSEXT
1142         /* TLS extensions*/
1143         if (!ssl_parse_serverhello_tlsext(s,&p,d,n))
1144                 {
1145                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_PARSE_TLSEXT);
1146                 goto err;
1147                 }
1148 #endif
1149
1150         if (p != (d+n))
1151                 {
1152                 /* wrong packet length */
1153                 al=SSL_AD_DECODE_ERROR;
1154                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_BAD_PACKET_LENGTH);
1155                 goto f_err;
1156                 }
1157
1158         return(1);
1159 f_err:
1160         ssl3_send_alert(s,SSL3_AL_FATAL,al);
1161 err:
1162         return(-1);
1163         }
1164
1165 int ssl3_get_server_certificate(SSL *s)
1166         {
1167         int al,i,ok,ret= -1;
1168         unsigned long n,nc,llen,l;
1169         X509 *x=NULL;
1170         const unsigned char *q,*p;
1171         unsigned char *d;
1172         STACK_OF(X509) *sk=NULL;
1173         SESS_CERT *sc;
1174         EVP_PKEY *pkey=NULL;
1175         int need_cert = 1; /* VRS: 0=> will allow null cert if auth == KRB5 */
1176
1177         n=s->method->ssl_get_message(s,
1178                 SSL3_ST_CR_CERT_A,
1179                 SSL3_ST_CR_CERT_B,
1180                 -1,
1181                 s->max_cert_list,
1182                 &ok);
1183
1184         if (!ok) return((int)n);
1185
1186         if ((s->s3->tmp.message_type == SSL3_MT_SERVER_KEY_EXCHANGE) ||
1187                 ((s->s3->tmp.new_cipher->algorithm_auth & SSL_aKRB5) &&
1188                 (s->s3->tmp.message_type == SSL3_MT_SERVER_DONE)))
1189                 {
1190                 s->s3->tmp.reuse_message=1;
1191                 return(1);
1192                 }
1193
1194         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE)
1195                 {
1196                 al=SSL_AD_UNEXPECTED_MESSAGE;
1197                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_BAD_MESSAGE_TYPE);
1198                 goto f_err;
1199                 }
1200         p=d=(unsigned char *)s->init_msg;
1201
1202         if ((sk=sk_X509_new_null()) == NULL)
1203                 {
1204                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,ERR_R_MALLOC_FAILURE);
1205                 goto err;
1206                 }
1207
1208         n2l3(p,llen);
1209         if (llen+3 != n)
1210                 {
1211                 al=SSL_AD_DECODE_ERROR;
1212                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_LENGTH_MISMATCH);
1213                 goto f_err;
1214                 }
1215         for (nc=0; nc<llen; )
1216                 {
1217                 n2l3(p,l);
1218                 if ((l+nc+3) > llen)
1219                         {
1220                         al=SSL_AD_DECODE_ERROR;
1221                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
1222                         goto f_err;
1223                         }
1224
1225                 q=p;
1226                 x=d2i_X509(NULL,&q,l);
1227                 if (x == NULL)
1228                         {
1229                         al=SSL_AD_BAD_CERTIFICATE;
1230                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,ERR_R_ASN1_LIB);
1231                         goto f_err;
1232                         }
1233                 if (q != (p+l))
1234                         {
1235                         al=SSL_AD_DECODE_ERROR;
1236                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
1237                         goto f_err;
1238                         }
1239                 if (!sk_X509_push(sk,x))
1240                         {
1241                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,ERR_R_MALLOC_FAILURE);
1242                         goto err;
1243                         }
1244                 x=NULL;
1245                 nc+=l+3;
1246                 p=q;
1247                 }
1248
1249         i=ssl_verify_cert_chain(s,sk);
1250         if ((s->verify_mode != SSL_VERIFY_NONE) && (i <= 0)
1251 #ifndef OPENSSL_NO_KRB5
1252             && !((s->s3->tmp.new_cipher->algorithm_mkey & SSL_kKRB5) &&
1253                  (s->s3->tmp.new_cipher->algorithm_auth & SSL_aKRB5))
1254 #endif /* OPENSSL_NO_KRB5 */
1255                 )
1256                 {
1257                 al=ssl_verify_alarm_type(s->verify_result);
1258                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_CERTIFICATE_VERIFY_FAILED);
1259                 goto f_err;
1260                 }
1261         ERR_clear_error(); /* but we keep s->verify_result */
1262
1263         sc=ssl_sess_cert_new();
1264         if (sc == NULL) goto err;
1265
1266         if (s->session->sess_cert) ssl_sess_cert_free(s->session->sess_cert);
1267         s->session->sess_cert=sc;
1268
1269         sc->cert_chain=sk;
1270         /* Inconsistency alert: cert_chain does include the peer's
1271          * certificate, which we don't include in s3_srvr.c */
1272         x=sk_X509_value(sk,0);
1273         sk=NULL;
1274         /* VRS 19990621: possible memory leak; sk=null ==> !sk_pop_free() @end*/
1275
1276         pkey=X509_get_pubkey(x);
1277
1278         /* VRS: allow null cert if auth == KRB5 */
1279         need_cert = ((s->s3->tmp.new_cipher->algorithm_mkey & SSL_kKRB5) &&
1280                     (s->s3->tmp.new_cipher->algorithm_auth & SSL_aKRB5))
1281                     ? 0 : 1;
1282
1283 #ifdef KSSL_DEBUG
1284         printf("pkey,x = %p, %p\n", pkey,x);
1285         printf("ssl_cert_type(x,pkey) = %d\n", ssl_cert_type(x,pkey));
1286         printf("cipher, alg, nc = %s, %lx, %lx, %d\n", s->s3->tmp.new_cipher->name,
1287                 s->s3->tmp.new_cipher->algorithm_mkey, s->s3->tmp.new_cipher->algorithm_auth, need_cert);
1288 #endif    /* KSSL_DEBUG */
1289
1290         if (need_cert && ((pkey == NULL) || EVP_PKEY_missing_parameters(pkey)))
1291                 {
1292                 x=NULL;
1293                 al=SSL3_AL_FATAL;
1294                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,
1295                         SSL_R_UNABLE_TO_FIND_PUBLIC_KEY_PARAMETERS);
1296                 goto f_err;
1297                 }
1298
1299         i=ssl_cert_type(x,pkey);
1300         if (need_cert && i < 0)
1301                 {
1302                 x=NULL;
1303                 al=SSL3_AL_FATAL;
1304                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,
1305                         SSL_R_UNKNOWN_CERTIFICATE_TYPE);
1306                 goto f_err;
1307                 }
1308
1309         if (need_cert)
1310                 {
1311                 int exp_idx = ssl_cipher_get_cert_index(s->s3->tmp.new_cipher);
1312                 if (exp_idx >= 0 && i != exp_idx)
1313                         {
1314                         x=NULL;
1315                         al=SSL_AD_ILLEGAL_PARAMETER;
1316                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,
1317                                 SSL_R_WRONG_CERTIFICATE_TYPE);
1318                         goto f_err;
1319                         }
1320                 sc->peer_cert_type=i;
1321                 CRYPTO_add(&x->references,1,CRYPTO_LOCK_X509);
1322                 /* Why would the following ever happen?
1323                  * We just created sc a couple of lines ago. */
1324                 if (sc->peer_pkeys[i].x509 != NULL)
1325                         X509_free(sc->peer_pkeys[i].x509);
1326                 sc->peer_pkeys[i].x509=x;
1327                 sc->peer_key= &(sc->peer_pkeys[i]);
1328
1329                 if (s->session->peer != NULL)
1330                         X509_free(s->session->peer);
1331                 CRYPTO_add(&x->references,1,CRYPTO_LOCK_X509);
1332                 s->session->peer=x;
1333                 }
1334         else
1335                 {
1336                 sc->peer_cert_type=i;
1337                 sc->peer_key= NULL;
1338
1339                 if (s->session->peer != NULL)
1340                         X509_free(s->session->peer);
1341                 s->session->peer=NULL;
1342                 }
1343         s->session->verify_result = s->verify_result;
1344
1345         x=NULL;
1346         ret=1;
1347         if (0)
1348                 {
1349 f_err:
1350                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
1351                 }
1352 err:
1353         EVP_PKEY_free(pkey);
1354         X509_free(x);
1355         sk_X509_pop_free(sk,X509_free);
1356         return(ret);
1357         }
1358
1359 int ssl3_get_key_exchange(SSL *s)
1360         {
1361 #ifndef OPENSSL_NO_RSA
1362         unsigned char *q,md_buf[EVP_MAX_MD_SIZE*2];
1363 #endif
1364         EVP_MD_CTX md_ctx;
1365         unsigned char *param,*p;
1366         int al,j,ok;
1367         long i,param_len,n,alg_k,alg_a;
1368         EVP_PKEY *pkey=NULL;
1369         const EVP_MD *md = NULL;
1370 #ifndef OPENSSL_NO_RSA
1371         RSA *rsa=NULL;
1372 #endif
1373 #ifndef OPENSSL_NO_DH
1374         DH *dh=NULL;
1375 #endif
1376 #ifndef OPENSSL_NO_ECDH
1377         EC_KEY *ecdh = NULL;
1378         BN_CTX *bn_ctx = NULL;
1379         EC_POINT *srvr_ecpoint = NULL;
1380         int curve_nid = 0;
1381         int encoded_pt_len = 0;
1382 #endif
1383
1384         /* use same message size as in ssl3_get_certificate_request()
1385          * as ServerKeyExchange message may be skipped */
1386         n=s->method->ssl_get_message(s,
1387                 SSL3_ST_CR_KEY_EXCH_A,
1388                 SSL3_ST_CR_KEY_EXCH_B,
1389                 -1,
1390                 s->max_cert_list,
1391                 &ok);
1392         if (!ok) return((int)n);
1393
1394         if (s->s3->tmp.message_type != SSL3_MT_SERVER_KEY_EXCHANGE)
1395                 {
1396 #ifndef OPENSSL_NO_PSK
1397                 /* In plain PSK ciphersuite, ServerKeyExchange can be
1398                    omitted if no identity hint is sent. Set
1399                    session->sess_cert anyway to avoid problems
1400                    later.*/
1401                 if (s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK)
1402                         {
1403                         s->session->sess_cert=ssl_sess_cert_new();
1404                         if (s->ctx->psk_identity_hint)
1405                                 OPENSSL_free(s->ctx->psk_identity_hint);
1406                         s->ctx->psk_identity_hint = NULL;
1407                         }
1408 #endif
1409                 s->s3->tmp.reuse_message=1;
1410                 return(1);
1411                 }
1412
1413         param=p=(unsigned char *)s->init_msg;
1414         if (s->session->sess_cert != NULL)
1415                 {
1416 #ifndef OPENSSL_NO_RSA
1417                 if (s->session->sess_cert->peer_rsa_tmp != NULL)
1418                         {
1419                         RSA_free(s->session->sess_cert->peer_rsa_tmp);
1420                         s->session->sess_cert->peer_rsa_tmp=NULL;
1421                         }
1422 #endif
1423 #ifndef OPENSSL_NO_DH
1424                 if (s->session->sess_cert->peer_dh_tmp)
1425                         {
1426                         DH_free(s->session->sess_cert->peer_dh_tmp);
1427                         s->session->sess_cert->peer_dh_tmp=NULL;
1428                         }
1429 #endif
1430 #ifndef OPENSSL_NO_ECDH
1431                 if (s->session->sess_cert->peer_ecdh_tmp)
1432                         {
1433                         EC_KEY_free(s->session->sess_cert->peer_ecdh_tmp);
1434                         s->session->sess_cert->peer_ecdh_tmp=NULL;
1435                         }
1436 #endif
1437                 }
1438         else
1439                 {
1440                 s->session->sess_cert=ssl_sess_cert_new();
1441                 }
1442
1443         /* Total length of the parameters including the length prefix */
1444         param_len=0;
1445
1446         alg_k=s->s3->tmp.new_cipher->algorithm_mkey;
1447         alg_a=s->s3->tmp.new_cipher->algorithm_auth;
1448         EVP_MD_CTX_init(&md_ctx);
1449
1450         al=SSL_AD_DECODE_ERROR;
1451
1452 #ifndef OPENSSL_NO_PSK
1453         if (alg_k & SSL_kPSK)
1454                 {
1455                 char tmp_id_hint[PSK_MAX_IDENTITY_LEN+1];
1456
1457                 param_len = 2;
1458                 if (param_len > n)
1459                         {
1460                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1461                                 SSL_R_LENGTH_TOO_SHORT);
1462                         goto f_err;
1463                         }
1464                 n2s(p,i);
1465
1466                 /* Store PSK identity hint for later use, hint is used
1467                  * in ssl3_send_client_key_exchange.  Assume that the
1468                  * maximum length of a PSK identity hint can be as
1469                  * long as the maximum length of a PSK identity. */
1470                 if (i > PSK_MAX_IDENTITY_LEN)
1471                         {
1472                         al=SSL_AD_HANDSHAKE_FAILURE;
1473                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1474                                 SSL_R_DATA_LENGTH_TOO_LONG);
1475                         goto f_err;
1476                         }
1477                 if (i > n - param_len)
1478                         {
1479                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1480                                 SSL_R_BAD_PSK_IDENTITY_HINT_LENGTH);
1481                         goto f_err;
1482                         }
1483                 param_len += i;
1484
1485                 /* If received PSK identity hint contains NULL
1486                  * characters, the hint is truncated from the first
1487                  * NULL. p may not be ending with NULL, so create a
1488                  * NULL-terminated string. */
1489                 memcpy(tmp_id_hint, p, i);
1490                 memset(tmp_id_hint+i, 0, PSK_MAX_IDENTITY_LEN+1-i);
1491                 if (s->ctx->psk_identity_hint != NULL)
1492                         OPENSSL_free(s->ctx->psk_identity_hint);
1493                 s->ctx->psk_identity_hint = BUF_strdup(tmp_id_hint);
1494                 if (s->ctx->psk_identity_hint == NULL)
1495                         {
1496                         al=SSL_AD_HANDSHAKE_FAILURE;
1497                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_MALLOC_FAILURE);
1498                         goto f_err;
1499                         }
1500
1501                 p+=i;
1502                 n-=param_len;
1503                 }
1504         else
1505 #endif /* !OPENSSL_NO_PSK */
1506 #ifndef OPENSSL_NO_SRP
1507         if (alg_k & SSL_kSRP)
1508                 {
1509                 param_len = 2;
1510                 if (param_len > n)
1511                         {
1512                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1513                                 SSL_R_LENGTH_TOO_SHORT);
1514                         goto f_err;
1515                         }
1516                 n2s(p,i);
1517
1518                 if (i > n - param_len)
1519                         {
1520                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SRP_N_LENGTH);
1521                         goto f_err;
1522                         }
1523                 param_len += i;
1524
1525                 if (!(s->srp_ctx.N=BN_bin2bn(p,i,NULL)))
1526                         {
1527                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1528                         goto err;
1529                         }
1530                 p+=i;
1531
1532
1533                 if (2 > n - param_len)
1534                         {
1535                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1536                                 SSL_R_LENGTH_TOO_SHORT);
1537                         goto f_err;
1538                         }
1539                 param_len += 2;
1540
1541                 n2s(p,i);
1542
1543                 if (i > n - param_len)
1544                         {
1545                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SRP_G_LENGTH);
1546                         goto f_err;
1547                         }
1548                 param_len += i;
1549
1550                 if (!(s->srp_ctx.g=BN_bin2bn(p,i,NULL)))
1551                         {
1552                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1553                         goto err;
1554                         }
1555                 p+=i;
1556
1557
1558                 if (1 > n - param_len)
1559                         {
1560                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1561                                 SSL_R_LENGTH_TOO_SHORT);
1562                         goto f_err;
1563                         }
1564                 param_len += 1;
1565
1566                 i = (unsigned int)(p[0]);
1567                 p++;
1568
1569                 if (i > n - param_len)
1570                         {
1571                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SRP_S_LENGTH);
1572                         goto f_err;
1573                         }
1574                 param_len += i;
1575
1576                 if (!(s->srp_ctx.s=BN_bin2bn(p,i,NULL)))
1577                         {
1578                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1579                         goto err;
1580                         }
1581                 p+=i;
1582
1583                 if (2 > n - param_len)
1584                         {
1585                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1586                                 SSL_R_LENGTH_TOO_SHORT);
1587                         goto f_err;
1588                         }
1589                 param_len += 2;
1590
1591                 n2s(p,i);
1592
1593                 if (i > n - param_len)
1594                         {
1595                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SRP_B_LENGTH);
1596                         goto f_err;
1597                         }
1598                 param_len += i;
1599
1600                 if (!(s->srp_ctx.B=BN_bin2bn(p,i,NULL)))
1601                         {
1602                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1603                         goto err;
1604                         }
1605                 p+=i;
1606                 n-=param_len;
1607
1608                 if (!srp_verify_server_param(s, &al))
1609                         {
1610                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SRP_PARAMETERS);
1611                         goto f_err;
1612                         }
1613
1614 /* We must check if there is a certificate */
1615 #ifndef OPENSSL_NO_RSA
1616                 if (alg_a & SSL_aRSA)
1617                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1618 #else
1619                 if (0)
1620                         ;
1621 #endif
1622 #ifndef OPENSSL_NO_DSA
1623                 else if (alg_a & SSL_aDSS)
1624                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_DSA_SIGN].x509);
1625 #endif
1626                 }
1627         else
1628 #endif /* !OPENSSL_NO_SRP */
1629 #ifndef OPENSSL_NO_RSA
1630         if (alg_k & SSL_kRSA)
1631                 {
1632                 if ((rsa=RSA_new()) == NULL)
1633                         {
1634                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1635                         goto err;
1636                         }
1637
1638                 param_len = 2;
1639                 if (param_len > n)
1640                         {
1641                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1642                                 SSL_R_LENGTH_TOO_SHORT);
1643                         goto f_err;
1644                         }
1645                 n2s(p,i);
1646
1647                 if (i > n - param_len)
1648                         {
1649                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_RSA_MODULUS_LENGTH);
1650                         goto f_err;
1651                         }
1652                 param_len += i;
1653
1654                 if (!(rsa->n=BN_bin2bn(p,i,rsa->n)))
1655                         {
1656                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1657                         goto err;
1658                         }
1659                 p+=i;
1660
1661                 if (2 > n - param_len)
1662                         {
1663                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1664                                 SSL_R_LENGTH_TOO_SHORT);
1665                         goto f_err;
1666                         }
1667                 param_len += 2;
1668
1669                 n2s(p,i);
1670
1671                 if (i > n - param_len)
1672                         {
1673                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_RSA_E_LENGTH);
1674                         goto f_err;
1675                         }
1676                 param_len += i;
1677
1678                 if (!(rsa->e=BN_bin2bn(p,i,rsa->e)))
1679                         {
1680                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1681                         goto err;
1682                         }
1683                 p+=i;
1684                 n-=param_len;
1685
1686                 /* this should be because we are using an export cipher */
1687                 if (alg_a & SSL_aRSA)
1688                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1689                 else
1690                         {
1691                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
1692                         goto err;
1693                         }
1694                 s->session->sess_cert->peer_rsa_tmp=rsa;
1695                 rsa=NULL;
1696                 }
1697 #else /* OPENSSL_NO_RSA */
1698         if (0)
1699                 ;
1700 #endif
1701 #ifndef OPENSSL_NO_DH
1702         else if (alg_k & SSL_kEDH)
1703                 {
1704                 if ((dh=DH_new()) == NULL)
1705                         {
1706                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_DH_LIB);
1707                         goto err;
1708                         }
1709
1710                 param_len = 2;
1711                 if (param_len > n)
1712                         {
1713                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1714                                 SSL_R_LENGTH_TOO_SHORT);
1715                         goto f_err;
1716                         }
1717                 n2s(p,i);
1718
1719                 if (i > n - param_len)
1720                         {
1721                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_DH_P_LENGTH);
1722                         goto f_err;
1723                         }
1724                 param_len += i;
1725
1726                 if (!(dh->p=BN_bin2bn(p,i,NULL)))
1727                         {
1728                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1729                         goto err;
1730                         }
1731                 p+=i;
1732
1733                 if (2 > n - param_len)
1734                         {
1735                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1736                                 SSL_R_LENGTH_TOO_SHORT);
1737                         goto f_err;
1738                         }
1739                 param_len += 2;
1740
1741                 n2s(p,i);
1742
1743                 if (i > n - param_len)
1744                         {
1745                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_DH_G_LENGTH);
1746                         goto f_err;
1747                         }
1748                 param_len += i;
1749
1750                 if (!(dh->g=BN_bin2bn(p,i,NULL)))
1751                         {
1752                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1753                         goto err;
1754                         }
1755                 p+=i;
1756
1757                 if (2 > n - param_len)
1758                         {
1759                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1760                                 SSL_R_LENGTH_TOO_SHORT);
1761                         goto f_err;
1762                         }
1763                 param_len += 2;
1764
1765                 n2s(p,i);
1766
1767                 if (i > n - param_len)
1768                         {
1769                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_DH_PUB_KEY_LENGTH);
1770                         goto f_err;
1771                         }
1772                 param_len += i;
1773
1774                 if (!(dh->pub_key=BN_bin2bn(p,i,NULL)))
1775                         {
1776                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1777                         goto err;
1778                         }
1779                 p+=i;
1780                 n-=param_len;
1781
1782 #ifndef OPENSSL_NO_RSA
1783                 if (alg_a & SSL_aRSA)
1784                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1785 #else
1786                 if (0)
1787                         ;
1788 #endif
1789 #ifndef OPENSSL_NO_DSA
1790                 else if (alg_a & SSL_aDSS)
1791                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_DSA_SIGN].x509);
1792 #endif
1793                 /* else anonymous DH, so no certificate or pkey. */
1794
1795                 s->session->sess_cert->peer_dh_tmp=dh;
1796                 dh=NULL;
1797                 }
1798         else if ((alg_k & SSL_kDHr) || (alg_k & SSL_kDHd))
1799                 {
1800                 al=SSL_AD_ILLEGAL_PARAMETER;
1801                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_TRIED_TO_USE_UNSUPPORTED_CIPHER);
1802                 goto f_err;
1803                 }
1804 #endif /* !OPENSSL_NO_DH */
1805
1806 #ifndef OPENSSL_NO_ECDH
1807         else if (alg_k & SSL_kEECDH)
1808                 {
1809                 EC_GROUP *ngroup;
1810                 const EC_GROUP *group;
1811
1812                 if ((ecdh=EC_KEY_new()) == NULL)
1813                         {
1814                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1815                         goto err;
1816                         }
1817
1818                 /* Extract elliptic curve parameters and the
1819                  * server's ephemeral ECDH public key.
1820                  * Keep accumulating lengths of various components in
1821                  * param_len and make sure it never exceeds n.
1822                  */
1823
1824                 /* XXX: For now we only support named (not generic) curves
1825                  * and the ECParameters in this case is just three bytes. We
1826                  * also need one byte for the length of the encoded point
1827                  */
1828                 param_len=4;
1829                 if (param_len > n)
1830                         {
1831                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1832                                 SSL_R_LENGTH_TOO_SHORT);
1833                         goto f_err;
1834                         }
1835                 /* Check curve is one of our preferences, if not server has
1836                  * sent an invalid curve. ECParameters is 3 bytes.
1837                  */
1838                 if (!tls1_check_curve(s, p, 3))
1839                         {
1840                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_WRONG_CURVE);
1841                         goto f_err;
1842                         }
1843
1844                 if ((curve_nid = tls1_ec_curve_id2nid(*(p + 2))) == 0)
1845                         {
1846                         al=SSL_AD_INTERNAL_ERROR;
1847                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_UNABLE_TO_FIND_ECDH_PARAMETERS);
1848                         goto f_err;
1849                         }
1850
1851                 ngroup = EC_GROUP_new_by_curve_name(curve_nid);
1852                 if (ngroup == NULL)
1853                         {
1854                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_EC_LIB);
1855                         goto err;
1856                         }
1857                 if (EC_KEY_set_group(ecdh, ngroup) == 0)
1858                         {
1859                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_EC_LIB);
1860                         goto err;
1861                         }
1862                 EC_GROUP_free(ngroup);
1863
1864                 group = EC_KEY_get0_group(ecdh);
1865
1866                 if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) &&
1867                     (EC_GROUP_get_degree(group) > 163))
1868                         {
1869                         al=SSL_AD_EXPORT_RESTRICTION;
1870                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_ECGROUP_TOO_LARGE_FOR_CIPHER);
1871                         goto f_err;
1872                         }
1873
1874                 p+=3;
1875
1876                 /* Next, get the encoded ECPoint */
1877                 if (((srvr_ecpoint = EC_POINT_new(group)) == NULL) ||
1878                     ((bn_ctx = BN_CTX_new()) == NULL))
1879                         {
1880                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1881                         goto err;
1882                         }
1883
1884                 encoded_pt_len = *p;  /* length of encoded point */
1885                 p+=1;
1886
1887                 if ((encoded_pt_len > n - param_len) ||
1888                     (EC_POINT_oct2point(group, srvr_ecpoint,
1889                         p, encoded_pt_len, bn_ctx) == 0))
1890                         {
1891                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_ECPOINT);
1892                         goto f_err;
1893                         }
1894                 param_len += encoded_pt_len;
1895
1896                 n-=param_len;
1897                 p+=encoded_pt_len;
1898
1899                 /* The ECC/TLS specification does not mention
1900                  * the use of DSA to sign ECParameters in the server
1901                  * key exchange message. We do support RSA and ECDSA.
1902                  */
1903                 if (0) ;
1904 #ifndef OPENSSL_NO_RSA
1905                 else if (alg_a & SSL_aRSA)
1906                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1907 #endif
1908 #ifndef OPENSSL_NO_ECDSA
1909                 else if (alg_a & SSL_aECDSA)
1910                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_ECC].x509);
1911 #endif
1912                 /* else anonymous ECDH, so no certificate or pkey. */
1913                 EC_KEY_set_public_key(ecdh, srvr_ecpoint);
1914                 s->session->sess_cert->peer_ecdh_tmp=ecdh;
1915                 ecdh=NULL;
1916                 BN_CTX_free(bn_ctx);
1917                 bn_ctx = NULL;
1918                 EC_POINT_free(srvr_ecpoint);
1919                 srvr_ecpoint = NULL;
1920                 }
1921         else if (alg_k)
1922                 {
1923                 al=SSL_AD_UNEXPECTED_MESSAGE;
1924                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_UNEXPECTED_MESSAGE);
1925                 goto f_err;
1926                 }
1927 #endif /* !OPENSSL_NO_ECDH */
1928
1929
1930         /* p points to the next byte, there are 'n' bytes left */
1931
1932         /* if it was signed, check the signature */
1933         if (pkey != NULL)
1934                 {
1935                 if (SSL_USE_SIGALGS(s))
1936                         {
1937                         int rv;
1938                         if (2 > n)
1939                                 {
1940                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1941                                         SSL_R_LENGTH_TOO_SHORT);
1942                                 goto f_err;
1943                                 }
1944                         rv = tls12_check_peer_sigalg(&md, s, p, pkey);
1945                         if (rv == -1)
1946                                 goto err;
1947                         else if (rv == 0)
1948                                 {
1949                                 goto f_err;
1950                                 }
1951 #ifdef SSL_DEBUG
1952 fprintf(stderr, "USING TLSv1.2 HASH %s\n", EVP_MD_name(md));
1953 #endif
1954                         p += 2;
1955                         n -= 2;
1956                         }
1957                 else
1958                         md = EVP_sha1();
1959
1960                 if (2 > n)
1961                         {
1962                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1963                                 SSL_R_LENGTH_TOO_SHORT);
1964                         goto f_err;
1965                         }
1966                 n2s(p,i);
1967                 n-=2;
1968                 j=EVP_PKEY_size(pkey);
1969
1970                 /* Check signature length. If n is 0 then signature is empty */
1971                 if ((i != n) || (n > j) || (n <= 0))
1972                         {
1973                         /* wrong packet length */
1974                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_WRONG_SIGNATURE_LENGTH);
1975                         goto f_err;
1976                         }
1977
1978 #ifndef OPENSSL_NO_RSA
1979                 if (pkey->type == EVP_PKEY_RSA && !SSL_USE_SIGALGS(s))
1980                         {
1981                         int num;
1982                         unsigned int size;
1983
1984                         j=0;
1985                         q=md_buf;
1986                         for (num=2; num > 0; num--)
1987                                 {
1988                                 EVP_MD_CTX_set_flags(&md_ctx,
1989                                         EVP_MD_CTX_FLAG_NON_FIPS_ALLOW);
1990                                 EVP_DigestInit_ex(&md_ctx,(num == 2)
1991                                         ?s->ctx->md5:s->ctx->sha1, NULL);
1992                                 EVP_DigestUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1993                                 EVP_DigestUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1994                                 EVP_DigestUpdate(&md_ctx,param,param_len);
1995                                 EVP_DigestFinal_ex(&md_ctx,q,&size);
1996                                 q+=size;
1997                                 j+=size;
1998                                 }
1999                         i=RSA_verify(NID_md5_sha1, md_buf, j, p, n,
2000                                                                 pkey->pkey.rsa);
2001                         if (i < 0)
2002                                 {
2003                                 al=SSL_AD_DECRYPT_ERROR;
2004                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_RSA_DECRYPT);
2005                                 goto f_err;
2006                                 }
2007                         if (i == 0)
2008                                 {
2009                                 /* bad signature */
2010                                 al=SSL_AD_DECRYPT_ERROR;
2011                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SIGNATURE);
2012                                 goto f_err;
2013                                 }
2014                         }
2015                 else
2016 #endif
2017                         {
2018                         EVP_VerifyInit_ex(&md_ctx, md, NULL);
2019                         EVP_VerifyUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
2020                         EVP_VerifyUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
2021                         EVP_VerifyUpdate(&md_ctx,param,param_len);
2022                         if (EVP_VerifyFinal(&md_ctx,p,(int)n,pkey) <= 0)
2023                                 {
2024                                 /* bad signature */
2025                                 al=SSL_AD_DECRYPT_ERROR;
2026                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SIGNATURE);
2027                                 goto f_err;
2028                                 }
2029                         }
2030                 }
2031         else
2032                 {
2033                 /* aNULL, aSRP or kPSK do not need public keys */
2034                 if (!(alg_a & (SSL_aNULL|SSL_aSRP)) && !(alg_k & SSL_kPSK))
2035                         {
2036                         /* Might be wrong key type, check it */
2037                         if (ssl3_check_cert_and_algorithm(s))
2038                                 /* Otherwise this shouldn't happen */
2039                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
2040                         goto err;
2041                         }
2042                 /* still data left over */
2043                 if (n != 0)
2044                         {
2045                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_EXTRA_DATA_IN_MESSAGE);
2046                         goto f_err;
2047                         }
2048                 }
2049         EVP_PKEY_free(pkey);
2050         EVP_MD_CTX_cleanup(&md_ctx);
2051         return(1);
2052 f_err:
2053         ssl3_send_alert(s,SSL3_AL_FATAL,al);
2054 err:
2055         EVP_PKEY_free(pkey);
2056 #ifndef OPENSSL_NO_RSA
2057         if (rsa != NULL)
2058                 RSA_free(rsa);
2059 #endif
2060 #ifndef OPENSSL_NO_DH
2061         if (dh != NULL)
2062                 DH_free(dh);
2063 #endif
2064 #ifndef OPENSSL_NO_ECDH
2065         BN_CTX_free(bn_ctx);
2066         EC_POINT_free(srvr_ecpoint);
2067         if (ecdh != NULL)
2068                 EC_KEY_free(ecdh);
2069 #endif
2070         EVP_MD_CTX_cleanup(&md_ctx);
2071         return(-1);
2072         }
2073
2074 int ssl3_get_certificate_request(SSL *s)
2075         {
2076         int ok,ret=0;
2077         unsigned long n,nc,l;
2078         unsigned int llen, ctype_num,i;
2079         X509_NAME *xn=NULL;
2080         const unsigned char *p,*q;
2081         unsigned char *d;
2082         STACK_OF(X509_NAME) *ca_sk=NULL;
2083
2084         n=s->method->ssl_get_message(s,
2085                 SSL3_ST_CR_CERT_REQ_A,
2086                 SSL3_ST_CR_CERT_REQ_B,
2087                 -1,
2088                 s->max_cert_list,
2089                 &ok);
2090
2091         if (!ok) return((int)n);
2092
2093         s->s3->tmp.cert_req=0;
2094
2095         if (s->s3->tmp.message_type == SSL3_MT_SERVER_DONE)
2096                 {
2097                 s->s3->tmp.reuse_message=1;
2098                 /* If we get here we don't need any cached handshake records
2099                  * as we wont be doing client auth.
2100                  */
2101                 if (s->s3->handshake_buffer)
2102                         {
2103                         if (!ssl3_digest_cached_records(s))
2104                                 goto err;
2105                         }
2106                 return(1);
2107                 }
2108
2109         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE_REQUEST)
2110                 {
2111                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_UNEXPECTED_MESSAGE);
2112                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_WRONG_MESSAGE_TYPE);
2113                 goto err;
2114                 }
2115
2116         /* TLS does not like anon-DH with client cert */
2117         if (s->version > SSL3_VERSION)
2118                 {
2119                 if (s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL)
2120                         {
2121                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_UNEXPECTED_MESSAGE);
2122                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_TLS_CLIENT_CERT_REQ_WITH_ANON_CIPHER);
2123                         goto err;
2124                         }
2125                 }
2126
2127         p=d=(unsigned char *)s->init_msg;
2128
2129         if ((ca_sk=sk_X509_NAME_new(ca_dn_cmp)) == NULL)
2130                 {
2131                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,ERR_R_MALLOC_FAILURE);
2132                 goto err;
2133                 }
2134
2135         /* get the certificate types */
2136         ctype_num= *(p++);
2137         if (s->cert->ctypes)
2138                 {
2139                 OPENSSL_free(s->cert->ctypes);
2140                 s->cert->ctypes = NULL;
2141                 }
2142         if (ctype_num > SSL3_CT_NUMBER)
2143                 {
2144                 /* If we exceed static buffer copy all to cert structure */
2145                 s->cert->ctypes = OPENSSL_malloc(ctype_num);
2146                 memcpy(s->cert->ctypes, p, ctype_num);
2147                 s->cert->ctype_num = (size_t)ctype_num;
2148                 ctype_num=SSL3_CT_NUMBER;
2149                 }
2150         for (i=0; i<ctype_num; i++)
2151                 s->s3->tmp.ctype[i]= p[i];
2152         p+=p[-1];
2153         if (SSL_USE_SIGALGS(s))
2154                 {
2155                 n2s(p, llen);
2156                 /* Check we have enough room for signature algorithms and
2157                  * following length value.
2158                  */
2159                 if ((unsigned long)(p - d + llen + 2) > n)
2160                         {
2161                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
2162                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_DATA_LENGTH_TOO_LONG);
2163                         goto err;
2164                         }
2165                 /* Clear certificate digests and validity flags */
2166                 for (i = 0; i < SSL_PKEY_NUM; i++)
2167                         {
2168                         s->cert->pkeys[i].digest = NULL;
2169                         s->cert->pkeys[i].valid_flags = 0;
2170                         }
2171                 if ((llen & 1) || !tls1_save_sigalgs(s, p, llen))
2172                         {
2173                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
2174                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_SIGNATURE_ALGORITHMS_ERROR);
2175                         goto err;
2176                         }
2177                 if (!tls1_process_sigalgs(s))
2178                         {
2179                         ssl3_send_alert(s,SSL3_AL_FATAL, SSL_AD_INTERNAL_ERROR);
2180                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST, ERR_R_MALLOC_FAILURE);
2181                         goto err;
2182                         }
2183                 p += llen;
2184                 }
2185
2186         /* get the CA RDNs */
2187         n2s(p,llen);
2188 #if 0
2189 {
2190 FILE *out;
2191 out=fopen("/tmp/vsign.der","w");
2192 fwrite(p,1,llen,out);
2193 fclose(out);
2194 }
2195 #endif
2196
2197         if ((unsigned long)(p - d + llen) != n)
2198                 {
2199                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
2200                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_LENGTH_MISMATCH);
2201                 goto err;
2202                 }
2203
2204         for (nc=0; nc<llen; )
2205                 {
2206                 n2s(p,l);
2207                 if ((l+nc+2) > llen)
2208                         {
2209                         if ((s->options & SSL_OP_NETSCAPE_CA_DN_BUG))
2210                                 goto cont; /* netscape bugs */
2211                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
2212                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_CA_DN_TOO_LONG);
2213                         goto err;
2214                         }
2215
2216                 q=p;
2217
2218                 if ((xn=d2i_X509_NAME(NULL,&q,l)) == NULL)
2219                         {
2220                         /* If netscape tolerance is on, ignore errors */
2221                         if (s->options & SSL_OP_NETSCAPE_CA_DN_BUG)
2222                                 goto cont;
2223                         else
2224                                 {
2225                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
2226                                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,ERR_R_ASN1_LIB);
2227                                 goto err;
2228                                 }
2229                         }
2230
2231                 if (q != (p+l))
2232                         {
2233                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
2234                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_CA_DN_LENGTH_MISMATCH);
2235                         goto err;
2236                         }
2237                 if (!sk_X509_NAME_push(ca_sk,xn))
2238                         {
2239                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,ERR_R_MALLOC_FAILURE);
2240                         goto err;
2241                         }
2242
2243                 p+=l;
2244                 nc+=l+2;
2245                 }
2246
2247         if (0)
2248                 {
2249 cont:
2250                 ERR_clear_error();
2251                 }
2252
2253         /* we should setup a certificate to return.... */
2254         s->s3->tmp.cert_req=1;
2255         s->s3->tmp.ctype_num=ctype_num;
2256         if (s->s3->tmp.ca_names != NULL)
2257                 sk_X509_NAME_pop_free(s->s3->tmp.ca_names,X509_NAME_free);
2258         s->s3->tmp.ca_names=ca_sk;
2259         ca_sk=NULL;
2260
2261         ret=1;
2262 err:
2263         if (ca_sk != NULL) sk_X509_NAME_pop_free(ca_sk,X509_NAME_free);
2264         return(ret);
2265         }
2266
2267 static int ca_dn_cmp(const X509_NAME * const *a, const X509_NAME * const *b)
2268         {
2269         return(X509_NAME_cmp(*a,*b));
2270         }
2271 #ifndef OPENSSL_NO_TLSEXT
2272 int ssl3_get_new_session_ticket(SSL *s)
2273         {
2274         int ok,al,ret=0, ticklen;
2275         long n;
2276         const unsigned char *p;
2277         unsigned char *d;
2278
2279         n=s->method->ssl_get_message(s,
2280                 SSL3_ST_CR_SESSION_TICKET_A,
2281                 SSL3_ST_CR_SESSION_TICKET_B,
2282                 -1,
2283                 16384,
2284                 &ok);
2285
2286         if (!ok)
2287                 return((int)n);
2288
2289         if (s->s3->tmp.message_type == SSL3_MT_FINISHED)
2290                 {
2291                 s->s3->tmp.reuse_message=1;
2292                 return(1);
2293                 }
2294         if (s->s3->tmp.message_type != SSL3_MT_NEWSESSION_TICKET)
2295                 {
2296                 al=SSL_AD_UNEXPECTED_MESSAGE;
2297                 SSLerr(SSL_F_SSL3_GET_NEW_SESSION_TICKET,SSL_R_BAD_MESSAGE_TYPE);
2298                 goto f_err;
2299                 }
2300         if (n < 6)
2301                 {
2302                 /* need at least ticket_lifetime_hint + ticket length */
2303                 al = SSL_AD_DECODE_ERROR;
2304                 SSLerr(SSL_F_SSL3_GET_NEW_SESSION_TICKET,SSL_R_LENGTH_MISMATCH);
2305                 goto f_err;
2306                 }
2307
2308         p=d=(unsigned char *)s->init_msg;
2309         n2l(p, s->session->tlsext_tick_lifetime_hint);
2310         n2s(p, ticklen);
2311         /* ticket_lifetime_hint + ticket_length + ticket */
2312         if (ticklen + 6 != n)
2313                 {
2314                 al = SSL_AD_DECODE_ERROR;
2315                 SSLerr(SSL_F_SSL3_GET_NEW_SESSION_TICKET,SSL_R_LENGTH_MISMATCH);
2316                 goto f_err;
2317                 }
2318         if (s->session->tlsext_tick)
2319                 {
2320                 OPENSSL_free(s->session->tlsext_tick);
2321                 s->session->tlsext_ticklen = 0;
2322                 }
2323         s->session->tlsext_tick = OPENSSL_malloc(ticklen);
2324         if (!s->session->tlsext_tick)
2325                 {
2326                 SSLerr(SSL_F_SSL3_GET_NEW_SESSION_TICKET,ERR_R_MALLOC_FAILURE);
2327                 goto err;
2328                 }
2329         memcpy(s->session->tlsext_tick, p, ticklen);
2330         s->session->tlsext_ticklen = ticklen;
2331         /* There are two ways to detect a resumed ticket sesion.
2332          * One is to set an appropriate session ID and then the server
2333          * must return a match in ServerHello. This allows the normal
2334          * client session ID matching to work and we know much
2335          * earlier that the ticket has been accepted.
2336          *
2337          * The other way is to set zero length session ID when the
2338          * ticket is presented and rely on the handshake to determine
2339          * session resumption.
2340          *
2341          * We choose the former approach because this fits in with
2342          * assumptions elsewhere in OpenSSL. The session ID is set
2343          * to the SHA256 (or SHA1 is SHA256 is disabled) hash of the
2344          * ticket.
2345          */
2346         EVP_Digest(p, ticklen,
2347                         s->session->session_id, &s->session->session_id_length,
2348 #ifndef OPENSSL_NO_SHA256
2349                                                         EVP_sha256(), NULL);
2350 #else
2351                                                         EVP_sha1(), NULL);
2352 #endif
2353         ret=1;
2354         return(ret);
2355 f_err:
2356         ssl3_send_alert(s,SSL3_AL_FATAL,al);
2357 err:
2358         return(-1);
2359         }
2360
2361 int ssl3_get_cert_status(SSL *s)
2362         {
2363         int ok, al;
2364         unsigned long resplen,n;
2365         const unsigned char *p;
2366
2367         n=s->method->ssl_get_message(s,
2368                 SSL3_ST_CR_CERT_STATUS_A,
2369                 SSL3_ST_CR_CERT_STATUS_B,
2370                 SSL3_MT_CERTIFICATE_STATUS,
2371                 16384,
2372                 &ok);
2373
2374         if (!ok) return((int)n);
2375         if (n < 4)
2376                 {
2377                 /* need at least status type + length */
2378                 al = SSL_AD_DECODE_ERROR;
2379                 SSLerr(SSL_F_SSL3_GET_CERT_STATUS,SSL_R_LENGTH_MISMATCH);
2380                 goto f_err;
2381                 }
2382         p = (unsigned char *)s->init_msg;
2383         if (*p++ != TLSEXT_STATUSTYPE_ocsp)
2384                 {
2385                 al = SSL_AD_DECODE_ERROR;
2386                 SSLerr(SSL_F_SSL3_GET_CERT_STATUS,SSL_R_UNSUPPORTED_STATUS_TYPE);
2387                 goto f_err;
2388                 }
2389         n2l3(p, resplen);
2390         if (resplen + 4 != n)
2391                 {
2392                 al = SSL_AD_DECODE_ERROR;
2393                 SSLerr(SSL_F_SSL3_GET_CERT_STATUS,SSL_R_LENGTH_MISMATCH);
2394                 goto f_err;
2395                 }
2396         if (s->tlsext_ocsp_resp)
2397                 OPENSSL_free(s->tlsext_ocsp_resp);
2398         s->tlsext_ocsp_resp = BUF_memdup(p, resplen);
2399         if (!s->tlsext_ocsp_resp)
2400                 {
2401                 al = SSL_AD_INTERNAL_ERROR;
2402                 SSLerr(SSL_F_SSL3_GET_CERT_STATUS,ERR_R_MALLOC_FAILURE);
2403                 goto f_err;
2404                 }
2405         s->tlsext_ocsp_resplen = resplen;
2406         if (s->ctx->tlsext_status_cb)
2407                 {
2408                 int ret;
2409                 ret = s->ctx->tlsext_status_cb(s, s->ctx->tlsext_status_arg);
2410                 if (ret == 0)
2411                         {
2412                         al = SSL_AD_BAD_CERTIFICATE_STATUS_RESPONSE;
2413                         SSLerr(SSL_F_SSL3_GET_CERT_STATUS,SSL_R_INVALID_STATUS_RESPONSE);
2414                         goto f_err;
2415                         }
2416                 if (ret < 0)
2417                         {
2418                         al = SSL_AD_INTERNAL_ERROR;
2419                         SSLerr(SSL_F_SSL3_GET_CERT_STATUS,ERR_R_MALLOC_FAILURE);
2420                         goto f_err;
2421                         }
2422                 }
2423         return 1;
2424 f_err:
2425         ssl3_send_alert(s,SSL3_AL_FATAL,al);
2426         return(-1);
2427         }
2428 #endif
2429
2430 int ssl3_get_server_done(SSL *s)
2431         {
2432         int ok,ret=0;
2433         long n;
2434
2435         n=s->method->ssl_get_message(s,
2436                 SSL3_ST_CR_SRVR_DONE_A,
2437                 SSL3_ST_CR_SRVR_DONE_B,
2438                 SSL3_MT_SERVER_DONE,
2439                 30, /* should be very small, like 0 :-) */
2440                 &ok);
2441
2442         if (!ok) return((int)n);
2443         if (n > 0)
2444                 {
2445                 /* should contain no data */
2446                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
2447                 SSLerr(SSL_F_SSL3_GET_SERVER_DONE,SSL_R_LENGTH_MISMATCH);
2448                 return -1;
2449                 }
2450         ret=1;
2451         return(ret);
2452         }
2453
2454
2455 int ssl3_send_client_key_exchange(SSL *s)
2456         {
2457         unsigned char *p;
2458         int n;
2459         unsigned long alg_k;
2460 #ifndef OPENSSL_NO_RSA
2461         unsigned char *q;
2462         EVP_PKEY *pkey=NULL;
2463 #endif
2464 #ifndef OPENSSL_NO_KRB5
2465         KSSL_ERR kssl_err;
2466 #endif /* OPENSSL_NO_KRB5 */
2467 #ifndef OPENSSL_NO_ECDH
2468         EC_KEY *clnt_ecdh = NULL;
2469         const EC_POINT *srvr_ecpoint = NULL;
2470         EVP_PKEY *srvr_pub_pkey = NULL;
2471         unsigned char *encodedPoint = NULL;
2472         int encoded_pt_len = 0;
2473         BN_CTX * bn_ctx = NULL;
2474 #endif
2475
2476         if (s->state == SSL3_ST_CW_KEY_EXCH_A)
2477                 {
2478                 p = ssl_handshake_start(s);
2479
2480                 alg_k=s->s3->tmp.new_cipher->algorithm_mkey;
2481
2482                 /* Fool emacs indentation */
2483                 if (0) {}
2484 #ifndef OPENSSL_NO_RSA
2485                 else if (alg_k & SSL_kRSA)
2486                         {
2487                         RSA *rsa;
2488                         unsigned char tmp_buf[SSL_MAX_MASTER_KEY_LENGTH];
2489
2490                         if (s->session->sess_cert == NULL)
2491                                 {
2492                                 /* We should always have a server certificate with SSL_kRSA. */
2493                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
2494                                 goto err;
2495                                 }
2496
2497                         if (s->session->sess_cert->peer_rsa_tmp != NULL)
2498                                 rsa=s->session->sess_cert->peer_rsa_tmp;
2499                         else
2500                                 {
2501                                 pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
2502                                 if ((pkey == NULL) ||
2503                                         (pkey->type != EVP_PKEY_RSA) ||
2504                                         (pkey->pkey.rsa == NULL))
2505                                         {
2506                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
2507                                         goto err;
2508                                         }
2509                                 rsa=pkey->pkey.rsa;
2510                                 EVP_PKEY_free(pkey);
2511                                 }
2512
2513                         tmp_buf[0]=s->client_version>>8;
2514                         tmp_buf[1]=s->client_version&0xff;
2515                         if (RAND_bytes(&(tmp_buf[2]),sizeof tmp_buf-2) <= 0)
2516                                         goto err;
2517
2518                         s->session->master_key_length=sizeof tmp_buf;
2519
2520                         q=p;
2521                         /* Fix buf for TLS and beyond */
2522                         if (s->version > SSL3_VERSION)
2523                                 p+=2;
2524                         n=RSA_public_encrypt(sizeof tmp_buf,
2525                                 tmp_buf,p,rsa,RSA_PKCS1_PADDING);
2526 #ifdef PKCS1_CHECK
2527                         if (s->options & SSL_OP_PKCS1_CHECK_1) p[1]++;
2528                         if (s->options & SSL_OP_PKCS1_CHECK_2) tmp_buf[0]=0x70;
2529 #endif
2530                         if (n <= 0)
2531                                 {
2532                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_BAD_RSA_ENCRYPT);
2533                                 goto err;
2534                                 }
2535
2536                         /* Fix buf for TLS and beyond */
2537                         if (s->version > SSL3_VERSION)
2538                                 {
2539                                 s2n(n,q);
2540                                 n+=2;
2541                                 }
2542
2543                         s->session->master_key_length=
2544                                 s->method->ssl3_enc->generate_master_secret(s,
2545                                         s->session->master_key,
2546                                         tmp_buf,sizeof tmp_buf);
2547                         OPENSSL_cleanse(tmp_buf,sizeof tmp_buf);
2548                         }
2549 #endif
2550 #ifndef OPENSSL_NO_KRB5
2551                 else if (alg_k & SSL_kKRB5)
2552                         {
2553                         krb5_error_code krb5rc;
2554                         KSSL_CTX        *kssl_ctx = s->kssl_ctx;
2555                         /*  krb5_data   krb5_ap_req;  */
2556                         krb5_data       *enc_ticket;
2557                         krb5_data       authenticator, *authp = NULL;
2558                         EVP_CIPHER_CTX  ciph_ctx;
2559                         const EVP_CIPHER *enc = NULL;
2560                         unsigned char   iv[EVP_MAX_IV_LENGTH];
2561                         unsigned char   tmp_buf[SSL_MAX_MASTER_KEY_LENGTH];
2562                         unsigned char   epms[SSL_MAX_MASTER_KEY_LENGTH
2563                                                 + EVP_MAX_IV_LENGTH];
2564                         int             padl, outl = sizeof(epms);
2565
2566                         EVP_CIPHER_CTX_init(&ciph_ctx);
2567
2568 #ifdef KSSL_DEBUG
2569                         printf("ssl3_send_client_key_exchange(%lx & %lx)\n",
2570                                 alg_k, SSL_kKRB5);
2571 #endif  /* KSSL_DEBUG */
2572
2573                         authp = NULL;
2574 #ifdef KRB5SENDAUTH
2575                         if (KRB5SENDAUTH)  authp = &authenticator;
2576 #endif  /* KRB5SENDAUTH */
2577
2578                         krb5rc = kssl_cget_tkt(kssl_ctx, &enc_ticket, authp,
2579                                 &kssl_err);
2580                         enc = kssl_map_enc(kssl_ctx->enctype);
2581                         if (enc == NULL)
2582                             goto err;
2583 #ifdef KSSL_DEBUG
2584                         {
2585                         printf("kssl_cget_tkt rtn %d\n", krb5rc);
2586                         if (krb5rc && kssl_err.text)
2587                           printf("kssl_cget_tkt kssl_err=%s\n", kssl_err.text);
2588                         }
2589 #endif  /* KSSL_DEBUG */
2590
2591                         if (krb5rc)
2592                                 {
2593                                 ssl3_send_alert(s,SSL3_AL_FATAL,
2594                                                 SSL_AD_HANDSHAKE_FAILURE);
2595                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2596                                                 kssl_err.reason);
2597                                 goto err;
2598                                 }
2599
2600                         /*  20010406 VRS - Earlier versions used KRB5 AP_REQ
2601                         **  in place of RFC 2712 KerberosWrapper, as in:
2602                         **
2603                         **  Send ticket (copy to *p, set n = length)
2604                         **  n = krb5_ap_req.length;
2605                         **  memcpy(p, krb5_ap_req.data, krb5_ap_req.length);
2606                         **  if (krb5_ap_req.data)
2607                         **    kssl_krb5_free_data_contents(NULL,&krb5_ap_req);
2608                         **
2609                         **  Now using real RFC 2712 KerberosWrapper
2610                         **  (Thanks to Simon Wilkinson <sxw@sxw.org.uk>)
2611                         **  Note: 2712 "opaque" types are here replaced
2612                         **  with a 2-byte length followed by the value.
2613                         **  Example:
2614                         **  KerberosWrapper= xx xx asn1ticket 0 0 xx xx encpms
2615                         **  Where "xx xx" = length bytes.  Shown here with
2616                         **  optional authenticator omitted.
2617                         */
2618
2619                         /*  KerberosWrapper.Ticket              */
2620                         s2n(enc_ticket->length,p);
2621                         memcpy(p, enc_ticket->data, enc_ticket->length);
2622                         p+= enc_ticket->length;
2623                         n = enc_ticket->length + 2;
2624
2625                         /*  KerberosWrapper.Authenticator       */
2626                         if (authp  &&  authp->length)
2627                                 {
2628                                 s2n(authp->length,p);
2629                                 memcpy(p, authp->data, authp->length);
2630                                 p+= authp->length;
2631                                 n+= authp->length + 2;
2632
2633                                 free(authp->data);
2634                                 authp->data = NULL;
2635                                 authp->length = 0;
2636                                 }
2637                         else
2638                                 {
2639                                 s2n(0,p);/*  null authenticator length  */
2640                                 n+=2;
2641                                 }
2642
2643                             tmp_buf[0]=s->client_version>>8;
2644                             tmp_buf[1]=s->client_version&0xff;
2645                             if (RAND_bytes(&(tmp_buf[2]),sizeof tmp_buf-2) <= 0)
2646                                 goto err;
2647
2648                         /*  20010420 VRS.  Tried it this way; failed.
2649                         **      EVP_EncryptInit_ex(&ciph_ctx,enc, NULL,NULL);
2650                         **      EVP_CIPHER_CTX_set_key_length(&ciph_ctx,
2651                         **                              kssl_ctx->length);
2652                         **      EVP_EncryptInit_ex(&ciph_ctx,NULL, key,iv);
2653                         */
2654
2655                         memset(iv, 0, sizeof iv);  /* per RFC 1510 */
2656                         EVP_EncryptInit_ex(&ciph_ctx,enc, NULL,
2657                                 kssl_ctx->key,iv);
2658                         EVP_EncryptUpdate(&ciph_ctx,epms,&outl,tmp_buf,
2659                                 sizeof tmp_buf);
2660                         EVP_EncryptFinal_ex(&ciph_ctx,&(epms[outl]),&padl);
2661                         outl += padl;
2662                         if (outl > (int)sizeof epms)
2663                                 {
2664                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
2665                                 goto err;
2666                                 }
2667                         EVP_CIPHER_CTX_cleanup(&ciph_ctx);
2668
2669                         /*  KerberosWrapper.EncryptedPreMasterSecret    */
2670                         s2n(outl,p);
2671                         memcpy(p, epms, outl);
2672                         p+=outl;
2673                         n+=outl + 2;
2674
2675                         s->session->master_key_length=
2676                                 s->method->ssl3_enc->generate_master_secret(s,
2677                                         s->session->master_key,
2678                                         tmp_buf, sizeof tmp_buf);
2679
2680                         OPENSSL_cleanse(tmp_buf, sizeof tmp_buf);
2681                         OPENSSL_cleanse(epms, outl);
2682                         }
2683 #endif
2684 #ifndef OPENSSL_NO_DH
2685                 else if (alg_k & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
2686                         {
2687                         DH *dh_srvr,*dh_clnt;
2688                         SESS_CERT *scert = s->session->sess_cert;
2689
2690                         if (scert == NULL)
2691                                 {
2692                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_UNEXPECTED_MESSAGE);
2693                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_UNEXPECTED_MESSAGE);
2694                                 goto err;
2695                                 }
2696
2697                         if (scert->peer_dh_tmp != NULL)
2698                                 dh_srvr=scert->peer_dh_tmp;
2699                         else
2700                                 {
2701                                 /* we get them from the cert */
2702                                 int idx = scert->peer_cert_type;
2703                                 EVP_PKEY *spkey = NULL;
2704                                 dh_srvr = NULL;
2705                                 if (idx >= 0)
2706                                         spkey = X509_get_pubkey(
2707                                                 scert->peer_pkeys[idx].x509);
2708                                 if (spkey)
2709                                         {
2710                                         dh_srvr = EVP_PKEY_get1_DH(spkey);
2711                                         EVP_PKEY_free(spkey);
2712                                         }
2713                                 if (dh_srvr == NULL)
2714                                         {
2715                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2716                                             ERR_R_INTERNAL_ERROR);
2717                                         goto err;
2718                                         }
2719                                 }
2720                         if (s->s3->flags & TLS1_FLAGS_SKIP_CERT_VERIFY)
2721                                 {
2722                                 /* Use client certificate key */
2723                                 EVP_PKEY *clkey = s->cert->key->privatekey;
2724                                 dh_clnt = NULL;
2725                                 if (clkey)
2726                                         dh_clnt = EVP_PKEY_get1_DH(clkey);
2727                                 if (dh_clnt == NULL)
2728                                         {
2729                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2730                                             ERR_R_INTERNAL_ERROR);
2731                                         goto err;
2732                                         }
2733                                 }
2734                         else
2735                                 {
2736                                 /* generate a new random key */
2737                                 if ((dh_clnt=DHparams_dup(dh_srvr)) == NULL)
2738                                         {
2739                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
2740                                         goto err;
2741                                         }
2742                                 if (!DH_generate_key(dh_clnt))
2743                                         {
2744                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
2745                                         DH_free(dh_clnt);
2746                                         goto err;
2747                                         }
2748                                 }
2749
2750                         /* use the 'p' output buffer for the DH key, but
2751                          * make sure to clear it out afterwards */
2752
2753                         n=DH_compute_key(p,dh_srvr->pub_key,dh_clnt);
2754                         if (scert->peer_dh_tmp == NULL)
2755                                 DH_free(dh_srvr);
2756
2757                         if (n <= 0)
2758                                 {
2759                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
2760                                 DH_free(dh_clnt);
2761                                 goto err;
2762                                 }
2763
2764                         /* generate master key from the result */
2765                         s->session->master_key_length=
2766                                 s->method->ssl3_enc->generate_master_secret(s,
2767                                         s->session->master_key,p,n);
2768                         /* clean up */
2769                         memset(p,0,n);
2770
2771                         if (s->s3->flags & TLS1_FLAGS_SKIP_CERT_VERIFY)
2772                                 n = 0;
2773                         else
2774                                 {
2775                                 /* send off the data */
2776                                 n=BN_num_bytes(dh_clnt->pub_key);
2777                                 s2n(n,p);
2778                                 BN_bn2bin(dh_clnt->pub_key,p);
2779                                 n+=2;
2780                                 }
2781
2782                         DH_free(dh_clnt);
2783
2784                         /* perhaps clean things up a bit EAY EAY EAY EAY*/
2785                         }
2786 #endif
2787
2788 #ifndef OPENSSL_NO_ECDH
2789                 else if (alg_k & (SSL_kEECDH|SSL_kECDHr|SSL_kECDHe))
2790                         {
2791                         const EC_GROUP *srvr_group = NULL;
2792                         EC_KEY *tkey;
2793                         int ecdh_clnt_cert = 0;
2794                         int field_size = 0;
2795
2796                         if (s->session->sess_cert == NULL)
2797                                 {
2798                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_UNEXPECTED_MESSAGE);
2799                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_UNEXPECTED_MESSAGE);
2800                                 goto err;
2801                                 }
2802
2803                         /* Did we send out the client's
2804                          * ECDH share for use in premaster
2805                          * computation as part of client certificate?
2806                          * If so, set ecdh_clnt_cert to 1.
2807                          */
2808                         if ((alg_k & (SSL_kECDHr|SSL_kECDHe)) && (s->cert != NULL))
2809                                 {
2810                                 /* XXX: For now, we do not support client
2811                                  * authentication using ECDH certificates.
2812                                  * To add such support, one needs to add
2813                                  * code that checks for appropriate
2814                                  * conditions and sets ecdh_clnt_cert to 1.
2815                                  * For example, the cert have an ECC
2816                                  * key on the same curve as the server's
2817                                  * and the key should be authorized for
2818                                  * key agreement.
2819                                  *
2820                                  * One also needs to add code in ssl3_connect
2821                                  * to skip sending the certificate verify
2822                                  * message.
2823                                  *
2824                                  * if ((s->cert->key->privatekey != NULL) &&
2825                                  *     (s->cert->key->privatekey->type ==
2826                                  *      EVP_PKEY_EC) && ...)
2827                                  * ecdh_clnt_cert = 1;
2828                                  */
2829                                 }
2830
2831                         if (s->session->sess_cert->peer_ecdh_tmp != NULL)
2832                                 {
2833                                 tkey = s->session->sess_cert->peer_ecdh_tmp;
2834                                 }
2835                         else
2836                                 {
2837                                 /* Get the Server Public Key from Cert */
2838                                 srvr_pub_pkey = X509_get_pubkey(s->session-> \
2839                                     sess_cert->peer_pkeys[SSL_PKEY_ECC].x509);
2840                                 if ((srvr_pub_pkey == NULL) ||
2841                                     (srvr_pub_pkey->type != EVP_PKEY_EC) ||
2842                                     (srvr_pub_pkey->pkey.ec == NULL))
2843                                         {
2844                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2845                                             ERR_R_INTERNAL_ERROR);
2846                                         goto err;
2847                                         }
2848
2849                                 tkey = srvr_pub_pkey->pkey.ec;
2850                                 }
2851
2852                         srvr_group   = EC_KEY_get0_group(tkey);
2853                         srvr_ecpoint = EC_KEY_get0_public_key(tkey);
2854
2855                         if ((srvr_group == NULL) || (srvr_ecpoint == NULL))
2856                                 {
2857                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2858                                     ERR_R_INTERNAL_ERROR);
2859                                 goto err;
2860                                 }
2861
2862                         if ((clnt_ecdh=EC_KEY_new()) == NULL)
2863                                 {
2864                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
2865                                 goto err;
2866                                 }
2867
2868                         if (!EC_KEY_set_group(clnt_ecdh, srvr_group))
2869                                 {
2870                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_EC_LIB);
2871                                 goto err;
2872                                 }
2873                         if (ecdh_clnt_cert)
2874                                 {
2875                                 /* Reuse key info from our certificate
2876                                  * We only need our private key to perform
2877                                  * the ECDH computation.
2878                                  */
2879                                 const BIGNUM *priv_key;
2880                                 tkey = s->cert->key->privatekey->pkey.ec;
2881                                 priv_key = EC_KEY_get0_private_key(tkey);
2882                                 if (priv_key == NULL)
2883                                         {
2884                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
2885                                         goto err;
2886                                         }
2887                                 if (!EC_KEY_set_private_key(clnt_ecdh, priv_key))
2888                                         {
2889                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_EC_LIB);
2890                                         goto err;
2891                                         }
2892                                 }
2893                         else
2894                                 {
2895                                 /* Generate a new ECDH key pair */
2896                                 if (!(EC_KEY_generate_key(clnt_ecdh)))
2897                                         {
2898                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, ERR_R_ECDH_LIB);
2899                                         goto err;
2900                                         }
2901                                 }
2902
2903                         /* use the 'p' output buffer for the ECDH key, but
2904                          * make sure to clear it out afterwards
2905                          */
2906
2907                         field_size = EC_GROUP_get_degree(srvr_group);
2908                         if (field_size <= 0)
2909                                 {
2910                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2911                                        ERR_R_ECDH_LIB);
2912                                 goto err;
2913                                 }
2914                         n=ECDH_compute_key(p, (field_size+7)/8, srvr_ecpoint, clnt_ecdh, NULL);
2915                         if (n <= 0)
2916                                 {
2917                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2918                                        ERR_R_ECDH_LIB);
2919                                 goto err;
2920                                 }
2921
2922                         /* generate master key from the result */
2923                         s->session->master_key_length = s->method->ssl3_enc \
2924                             -> generate_master_secret(s,
2925                                 s->session->master_key,
2926                                 p, n);
2927
2928                         memset(p, 0, n); /* clean up */
2929
2930                         if (ecdh_clnt_cert)
2931                                 {
2932                                 /* Send empty client key exch message */
2933                                 n = 0;
2934                                 }
2935                         else
2936                                 {
2937                                 /* First check the size of encoding and
2938                                  * allocate memory accordingly.
2939                                  */
2940                                 encoded_pt_len =
2941                                     EC_POINT_point2oct(srvr_group,
2942                                         EC_KEY_get0_public_key(clnt_ecdh),
2943                                         POINT_CONVERSION_UNCOMPRESSED,
2944                                         NULL, 0, NULL);
2945
2946                                 encodedPoint = (unsigned char *)
2947                                     OPENSSL_malloc(encoded_pt_len *
2948                                         sizeof(unsigned char));
2949                                 bn_ctx = BN_CTX_new();
2950                                 if ((encodedPoint == NULL) ||
2951                                     (bn_ctx == NULL))
2952                                         {
2953                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
2954                                         goto err;
2955                                         }
2956
2957                                 /* Encode the public key */
2958                                 n = EC_POINT_point2oct(srvr_group,
2959                                     EC_KEY_get0_public_key(clnt_ecdh),
2960                                     POINT_CONVERSION_UNCOMPRESSED,
2961                                     encodedPoint, encoded_pt_len, bn_ctx);
2962
2963                                 *p = n; /* length of encoded point */
2964                                 /* Encoded point will be copied here */
2965                                 p += 1;
2966                                 /* copy the point */
2967                                 memcpy((unsigned char *)p, encodedPoint, n);
2968                                 /* increment n to account for length field */
2969                                 n += 1;
2970                                 }
2971
2972                         /* Free allocated memory */
2973                         BN_CTX_free(bn_ctx);
2974                         if (encodedPoint != NULL) OPENSSL_free(encodedPoint);
2975                         if (clnt_ecdh != NULL)
2976                                  EC_KEY_free(clnt_ecdh);
2977                         EVP_PKEY_free(srvr_pub_pkey);
2978                         }
2979 #endif /* !OPENSSL_NO_ECDH */
2980                 else if (alg_k & SSL_kGOST)
2981                         {
2982                         /* GOST key exchange message creation */
2983                         EVP_PKEY_CTX *pkey_ctx;
2984                         X509 *peer_cert;
2985                         size_t msglen;
2986                         unsigned int md_len;
2987                         int keytype;
2988                         unsigned char premaster_secret[32],shared_ukm[32], tmp[256];
2989                         EVP_MD_CTX *ukm_hash;
2990                         EVP_PKEY *pub_key;
2991
2992                         /* Get server sertificate PKEY and create ctx from it */
2993                         peer_cert=s->session->sess_cert->peer_pkeys[(keytype=SSL_PKEY_GOST01)].x509;
2994                         if (!peer_cert)
2995                                 peer_cert=s->session->sess_cert->peer_pkeys[(keytype=SSL_PKEY_GOST94)].x509;
2996                         if (!peer_cert)         {
2997                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_NO_GOST_CERTIFICATE_SENT_BY_PEER);
2998                                         goto err;
2999                                 }
3000
3001                         pkey_ctx=EVP_PKEY_CTX_new(pub_key=X509_get_pubkey(peer_cert),NULL);
3002                         /* If we have send a certificate, and certificate key
3003
3004                          * parameters match those of server certificate, use
3005                          * certificate key for key exchange
3006                          */
3007
3008                          /* Otherwise, generate ephemeral key pair */
3009
3010                         EVP_PKEY_encrypt_init(pkey_ctx);
3011                           /* Generate session key */
3012                     RAND_bytes(premaster_secret,32);
3013                         /* If we have client certificate, use its secret as peer key */
3014                         if (s->s3->tmp.cert_req && s->cert->key->privatekey) {
3015                                 if (EVP_PKEY_derive_set_peer(pkey_ctx,s->cert->key->privatekey) <=0) {
3016                                         /* If there was an error - just ignore it. Ephemeral key
3017                                         * would be used
3018                                         */
3019                                         ERR_clear_error();
3020                                 }
3021                         }
3022                         /* Compute shared IV and store it in algorithm-specific
3023                          * context data */
3024                         ukm_hash = EVP_MD_CTX_create();
3025                         EVP_DigestInit(ukm_hash,EVP_get_digestbynid(NID_id_GostR3411_94));
3026                         EVP_DigestUpdate(ukm_hash,s->s3->client_random,SSL3_RANDOM_SIZE);
3027                         EVP_DigestUpdate(ukm_hash,s->s3->server_random,SSL3_RANDOM_SIZE);
3028                         EVP_DigestFinal_ex(ukm_hash, shared_ukm, &md_len);
3029                         EVP_MD_CTX_destroy(ukm_hash);
3030                         if (EVP_PKEY_CTX_ctrl(pkey_ctx,-1,EVP_PKEY_OP_ENCRYPT,EVP_PKEY_CTRL_SET_IV,
3031                                 8,shared_ukm)<0) {
3032                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
3033                                                 SSL_R_LIBRARY_BUG);
3034                                         goto err;
3035                                 }
3036                         /* Make GOST keytransport blob message */
3037                         /*Encapsulate it into sequence */
3038                         *(p++)=V_ASN1_SEQUENCE | V_ASN1_CONSTRUCTED;
3039                         msglen=255;
3040                         if (EVP_PKEY_encrypt(pkey_ctx,tmp,&msglen,premaster_secret,32)<0) {
3041                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
3042                                         SSL_R_LIBRARY_BUG);
3043                                 goto err;
3044                         }
3045                         if (msglen >= 0x80)
3046                                 {
3047                                 *(p++)=0x81;
3048                                 *(p++)= msglen & 0xff;
3049                                 n=msglen+3;
3050                                 }
3051                         else
3052                                 {
3053                                 *(p++)= msglen & 0xff;
3054                                 n=msglen+2;
3055                                 }
3056                         memcpy(p, tmp, msglen);
3057                         /* Check if pubkey from client certificate was used */
3058                         if (EVP_PKEY_CTX_ctrl(pkey_ctx, -1, -1, EVP_PKEY_CTRL_PEER_KEY, 2, NULL) > 0)
3059                                 {
3060                                 /* Set flag "skip certificate verify" */
3061                                 s->s3->flags |= TLS1_FLAGS_SKIP_CERT_VERIFY;
3062                                 }
3063                         EVP_PKEY_CTX_free(pkey_ctx);
3064                         s->session->master_key_length=
3065                                 s->method->ssl3_enc->generate_master_secret(s,
3066                                         s->session->master_key,premaster_secret,32);
3067                         EVP_PKEY_free(pub_key);
3068
3069                         }
3070 #ifndef OPENSSL_NO_SRP
3071                 else if (alg_k & SSL_kSRP)
3072                         {
3073                         if (s->srp_ctx.A != NULL)
3074                                 {
3075                                 /* send off the data */
3076                                 n=BN_num_bytes(s->srp_ctx.A);
3077                                 s2n(n,p);
3078                                 BN_bn2bin(s->srp_ctx.A,p);
3079                                 n+=2;
3080                                 }
3081                         else
3082                                 {
3083                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
3084                                 goto err;
3085                                 }
3086                         if (s->session->srp_username != NULL)
3087                                 OPENSSL_free(s->session->srp_username);
3088                         s->session->srp_username = BUF_strdup(s->srp_ctx.login);
3089                         if (s->session->srp_username == NULL)
3090                                 {
3091                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
3092                                         ERR_R_MALLOC_FAILURE);
3093                                 goto err;
3094                                 }
3095
3096                         if ((s->session->master_key_length = SRP_generate_client_master_secret(s,s->session->master_key))<0)
3097                                 {
3098                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
3099                                 goto err;
3100                                 }
3101                         }
3102 #endif
3103 #ifndef OPENSSL_NO_PSK
3104                 else if (alg_k & SSL_kPSK)
3105                         {
3106                         /* The callback needs PSK_MAX_IDENTITY_LEN + 1 bytes
3107                          * to return a \0-terminated identity. The last byte
3108                          * is for us for simulating strnlen. */
3109                         char identity[PSK_MAX_IDENTITY_LEN + 2];
3110                         size_t identity_len;
3111                         unsigned char *t = NULL;
3112                         unsigned char psk_or_pre_ms[PSK_MAX_PSK_LEN*2+4];
3113                         unsigned int pre_ms_len = 0, psk_len = 0;
3114                         int psk_err = 1;
3115
3116                         n = 0;
3117                         if (s->psk_client_callback == NULL)
3118                                 {
3119                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
3120                                         SSL_R_PSK_NO_CLIENT_CB);
3121                                 goto err;
3122                                 }
3123
3124                         memset(identity, 0, sizeof(identity));
3125                         psk_len = s->psk_client_callback(s, s->ctx->psk_identity_hint,
3126                                 identity, sizeof(identity) - 1,
3127                                 psk_or_pre_ms, sizeof(psk_or_pre_ms));
3128                         if (psk_len > PSK_MAX_PSK_LEN)
3129                                 {
3130                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
3131                                         ERR_R_INTERNAL_ERROR);
3132                                 goto psk_err;
3133                                 }
3134                         else if (psk_len == 0)
3135                                 {
3136                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
3137                                         SSL_R_PSK_IDENTITY_NOT_FOUND);
3138                                 goto psk_err;
3139                                 }
3140                         identity[PSK_MAX_IDENTITY_LEN + 1] = '\0';
3141                         identity_len = strlen(identity);
3142                         if (identity_len > PSK_MAX_IDENTITY_LEN)
3143                                 {
3144                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
3145                                         ERR_R_INTERNAL_ERROR);
3146                                 goto psk_err;
3147                                 }
3148                         /* create PSK pre_master_secret */
3149                         pre_ms_len = 2+psk_len+2+psk_len;
3150                         t = psk_or_pre_ms;
3151                         memmove(psk_or_pre_ms+psk_len+4, psk_or_pre_ms, psk_len);
3152                         s2n(psk_len, t);
3153                         memset(t, 0, psk_len);
3154                         t+=psk_len;
3155                         s2n(psk_len, t);
3156
3157                         if (s->session->psk_identity_hint != NULL)
3158                                 OPENSSL_free(s->session->psk_identity_hint);
3159                         s->session->psk_identity_hint = BUF_strdup(s->ctx->psk_identity_hint);
3160                         if (s->ctx->psk_identity_hint != NULL &&
3161                                 s->session->psk_identity_hint == NULL)
3162                                 {
3163                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
3164                                         ERR_R_MALLOC_FAILURE);
3165                                 goto psk_err;
3166                                 }
3167
3168                         if (s->session->psk_identity != NULL)
3169                                 OPENSSL_free(s->session->psk_identity);
3170                         s->session->psk_identity = BUF_strdup(identity);
3171                         if (s->session->psk_identity == NULL)
3172                                 {
3173                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
3174                                         ERR_R_MALLOC_FAILURE);
3175                                 goto psk_err;
3176                                 }
3177
3178                         s->session->master_key_length =
3179                                 s->method->ssl3_enc->generate_master_secret(s,
3180                                         s->session->master_key,
3181                                         psk_or_pre_ms, pre_ms_len);
3182                         s2n(identity_len, p);
3183                         memcpy(p, identity, identity_len);
3184                         n = 2 + identity_len;
3185                         psk_err = 0;
3186                 psk_err:
3187                         OPENSSL_cleanse(identity, sizeof(identity));
3188                         OPENSSL_cleanse(psk_or_pre_ms, sizeof(psk_or_pre_ms));
3189                         if (psk_err != 0)
3190                                 {
3191                                 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE);
3192                                 goto err;
3193                                 }
3194                         }
3195 #endif
3196                 else
3197                         {
3198                         ssl3_send_alert(s, SSL3_AL_FATAL,
3199                             SSL_AD_HANDSHAKE_FAILURE);
3200                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
3201                             ERR_R_INTERNAL_ERROR);
3202                         goto err;
3203                         }
3204
3205                 ssl_set_handshake_header(s, SSL3_MT_CLIENT_KEY_EXCHANGE, n);
3206                 s->state=SSL3_ST_CW_KEY_EXCH_B;
3207                 }
3208
3209         /* SSL3_ST_CW_KEY_EXCH_B */
3210         return ssl_do_write(s);
3211 err:
3212 #ifndef OPENSSL_NO_ECDH
3213         BN_CTX_free(bn_ctx);
3214         if (encodedPoint != NULL) OPENSSL_free(encodedPoint);
3215         if (clnt_ecdh != NULL)
3216                 EC_KEY_free(clnt_ecdh);
3217         EVP_PKEY_free(srvr_pub_pkey);
3218 #endif
3219         return(-1);
3220         }
3221
3222 int ssl3_send_client_verify(SSL *s)
3223         {
3224         unsigned char *p;
3225         unsigned char data[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
3226         EVP_PKEY *pkey;
3227         EVP_PKEY_CTX *pctx=NULL;
3228         EVP_MD_CTX mctx;
3229         unsigned u=0;
3230         unsigned long n;
3231         int j;
3232
3233         EVP_MD_CTX_init(&mctx);
3234
3235         if (s->state == SSL3_ST_CW_CERT_VRFY_A)
3236                 {
3237                 p= ssl_handshake_start(s);
3238                 pkey=s->cert->key->privatekey;
3239 /* Create context from key and test if sha1 is allowed as digest */
3240                 pctx = EVP_PKEY_CTX_new(pkey,NULL);
3241                 EVP_PKEY_sign_init(pctx);
3242                 if (EVP_PKEY_CTX_set_signature_md(pctx, EVP_sha1())>0)
3243                         {
3244                         if (!SSL_USE_SIGALGS(s))
3245                                 s->method->ssl3_enc->cert_verify_mac(s,
3246                                                 NID_sha1,
3247                                                 &(data[MD5_DIGEST_LENGTH]));
3248                         }
3249                 else
3250                         {
3251                         ERR_clear_error();
3252                         }
3253                 /* For TLS v1.2 send signature algorithm and signature
3254                  * using agreed digest and cached handshake records.
3255                  */
3256                 if (SSL_USE_SIGALGS(s))
3257                         {
3258                         long hdatalen = 0;
3259                         void *hdata;
3260                         const EVP_MD *md = s->cert->key->digest;
3261                         hdatalen = BIO_get_mem_data(s->s3->handshake_buffer,
3262                                                                 &hdata);
3263                         if (hdatalen <= 0 || !tls12_get_sigandhash(p, pkey, md))
3264                                 {
3265                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,
3266                                                 ERR_R_INTERNAL_ERROR);
3267                                 goto err;
3268                                 }
3269                         p += 2;
3270 #ifdef SSL_DEBUG
3271                         fprintf(stderr, "Using TLS 1.2 with client alg %s\n",
3272                                                         EVP_MD_name(md));
3273 #endif
3274                         if (!EVP_SignInit_ex(&mctx, md, NULL)
3275                                 || !EVP_SignUpdate(&mctx, hdata, hdatalen)
3276                                 || !EVP_SignFinal(&mctx, p + 2, &u, pkey))
3277                                 {
3278                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,
3279                                                 ERR_R_EVP_LIB);
3280                                 goto err;
3281                                 }
3282                         s2n(u,p);
3283                         n = u + 4;
3284                         if (!ssl3_digest_cached_records(s))
3285                                 goto err;
3286                         }
3287                 else
3288 #ifndef OPENSSL_NO_RSA
3289                 if (pkey->type == EVP_PKEY_RSA)
3290                         {
3291                         s->method->ssl3_enc->cert_verify_mac(s,
3292                                 NID_md5,
3293                                 &(data[0]));
3294                         if (RSA_sign(NID_md5_sha1, data,
3295                                          MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH,
3296                                         &(p[2]), &u, pkey->pkey.rsa) <= 0 )
3297                                 {
3298                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,ERR_R_RSA_LIB);
3299                                 goto err;
3300                                 }
3301                         s2n(u,p);
3302                         n=u+2;
3303                         }
3304                 else
3305 #endif
3306 #ifndef OPENSSL_NO_DSA
3307                         if (pkey->type == EVP_PKEY_DSA)
3308                         {
3309                         if (!DSA_sign(pkey->save_type,
3310                                 &(data[MD5_DIGEST_LENGTH]),
3311                                 SHA_DIGEST_LENGTH,&(p[2]),
3312                                 (unsigned int *)&j,pkey->pkey.dsa))
3313                                 {
3314                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,ERR_R_DSA_LIB);
3315                                 goto err;
3316                                 }
3317                         s2n(j,p);
3318                         n=j+2;
3319                         }
3320                 else
3321 #endif
3322 #ifndef OPENSSL_NO_ECDSA
3323                         if (pkey->type == EVP_PKEY_EC)
3324                         {
3325                         if (!ECDSA_sign(pkey->save_type,
3326                                 &(data[MD5_DIGEST_LENGTH]),
3327                                 SHA_DIGEST_LENGTH,&(p[2]),
3328                                 (unsigned int *)&j,pkey->pkey.ec))
3329                                 {
3330                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,
3331                                     ERR_R_ECDSA_LIB);
3332                                 goto err;
3333                                 }
3334                         s2n(j,p);
3335                         n=j+2;
3336                         }
3337                 else
3338 #endif
3339                 if (pkey->type == NID_id_GostR3410_94 || pkey->type == NID_id_GostR3410_2001)
3340                 {
3341                 unsigned char signbuf[64];
3342                 int i;
3343                 size_t sigsize=64;
3344                 s->method->ssl3_enc->cert_verify_mac(s,
3345                         NID_id_GostR3411_94,
3346                         data);
3347                 if (EVP_PKEY_sign(pctx, signbuf, &sigsize, data, 32) <= 0) {
3348                         SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,
3349                         ERR_R_INTERNAL_ERROR);
3350                         goto err;
3351                 }
3352                 for (i=63,j=0; i>=0; j++, i--) {
3353                         p[2+j]=signbuf[i];
3354                 }
3355                 s2n(j,p);
3356                 n=j+2;
3357                 }
3358                 else
3359                 {
3360                         SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,ERR_R_INTERNAL_ERROR);
3361                         goto err;
3362                 }
3363                 ssl_set_handshake_header(s, SSL3_MT_CERTIFICATE_VERIFY, n);
3364                 s->state=SSL3_ST_CW_CERT_VRFY_B;
3365                 }
3366         EVP_MD_CTX_cleanup(&mctx);
3367         EVP_PKEY_CTX_free(pctx);
3368         return ssl_do_write(s);
3369 err:
3370         EVP_MD_CTX_cleanup(&mctx);
3371         EVP_PKEY_CTX_free(pctx);
3372         return(-1);
3373         }
3374
3375 /* Check a certificate can be used for client authentication. Currently
3376  * check cert exists, if we have a suitable digest for TLS 1.2 if
3377  * static DH client certificates can be used and optionally checks
3378  * suitability for Suite B.
3379  */
3380 static int ssl3_check_client_certificate(SSL *s)
3381         {
3382         unsigned long alg_k;
3383         if (!s->cert || !s->cert->key->x509 || !s->cert->key->privatekey)
3384                 return 0;
3385         /* If no suitable signature algorithm can't use certificate */
3386         if (SSL_USE_SIGALGS(s) && !s->cert->key->digest)
3387                 return 0;
3388         /* If strict mode check suitability of chain before using it.
3389          * This also adjusts suite B digest if necessary.
3390          */
3391         if (s->cert->cert_flags & SSL_CERT_FLAGS_CHECK_TLS_STRICT &&
3392                 !tls1_check_chain(s, NULL, NULL, NULL, -2))
3393                 return 0;
3394         alg_k=s->s3->tmp.new_cipher->algorithm_mkey;
3395         /* See if we can use client certificate for fixed DH */
3396         if (alg_k & (SSL_kDHr|SSL_kDHd))
3397                 {
3398                 SESS_CERT *scert = s->session->sess_cert;
3399                 int i = scert->peer_cert_type;
3400                 EVP_PKEY *clkey = NULL, *spkey = NULL;
3401                 clkey = s->cert->key->privatekey;
3402                 /* If client key not DH assume it can be used */
3403                 if (EVP_PKEY_id(clkey) != EVP_PKEY_DH)
3404                         return 1;
3405                 if (i >= 0)
3406                         spkey = X509_get_pubkey(scert->peer_pkeys[i].x509);
3407                 if (spkey)
3408                         {
3409                         /* Compare server and client parameters */
3410                         i = EVP_PKEY_cmp_parameters(clkey, spkey);
3411                         EVP_PKEY_free(spkey);
3412                         if (i != 1)
3413                                 return 0;
3414                         }
3415                 s->s3->flags |= TLS1_FLAGS_SKIP_CERT_VERIFY;
3416                 }
3417         return 1;
3418         }
3419
3420 int ssl3_send_client_certificate(SSL *s)
3421         {
3422         X509 *x509=NULL;
3423         EVP_PKEY *pkey=NULL;
3424         int i;
3425
3426         if (s->state == SSL3_ST_CW_CERT_A)
3427                 {
3428                 /* Let cert callback update client certificates if required */
3429                 if (s->cert->cert_cb)
3430                         {
3431                         i = s->cert->cert_cb(s, s->cert->cert_cb_arg);
3432                         if (i < 0)
3433                                 {
3434                                 s->rwstate=SSL_X509_LOOKUP;
3435                                 return -1;
3436                                 }
3437                         if (i == 0)
3438                                 {
3439                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_INTERNAL_ERROR);
3440                                 return 0;
3441                                 }
3442                         s->rwstate=SSL_NOTHING;
3443                         }
3444                 if (ssl3_check_client_certificate(s))
3445                         s->state=SSL3_ST_CW_CERT_C;
3446                 else
3447                         s->state=SSL3_ST_CW_CERT_B;
3448                 }
3449
3450         /* We need to get a client cert */
3451         if (s->state == SSL3_ST_CW_CERT_B)
3452                 {
3453                 /* If we get an error, we need to
3454                  * ssl->rwstate=SSL_X509_LOOKUP; return(-1);
3455                  * We then get retied later */
3456                 i=0;
3457                 i = ssl_do_client_cert_cb(s, &x509, &pkey);
3458                 if (i < 0)
3459                         {
3460                         s->rwstate=SSL_X509_LOOKUP;
3461                         return(-1);
3462                         }
3463                 s->rwstate=SSL_NOTHING;
3464                 if ((i == 1) && (pkey != NULL) && (x509 != NULL))
3465                         {
3466                         s->state=SSL3_ST_CW_CERT_B;
3467                         if (    !SSL_use_certificate(s,x509) ||
3468                                 !SSL_use_PrivateKey(s,pkey))
3469                                 i=0;
3470                         }
3471                 else if (i == 1)
3472                         {
3473                         i=0;
3474                         SSLerr(SSL_F_SSL3_SEND_CLIENT_CERTIFICATE,SSL_R_BAD_DATA_RETURNED_BY_CALLBACK);
3475                         }
3476
3477                 if (x509 != NULL) X509_free(x509);
3478                 if (pkey != NULL) EVP_PKEY_free(pkey);
3479                 if (i && !ssl3_check_client_certificate(s))
3480                         i = 0;
3481                 if (i == 0)
3482                         {
3483                         if (s->version == SSL3_VERSION)
3484                                 {
3485                                 s->s3->tmp.cert_req=0;
3486                                 ssl3_send_alert(s,SSL3_AL_WARNING,SSL_AD_NO_CERTIFICATE);
3487                                 return(1);
3488                                 }
3489                         else
3490                                 {
3491                                 s->s3->tmp.cert_req=2;
3492                                 }
3493                         }
3494
3495                 /* Ok, we have a cert */
3496                 s->state=SSL3_ST_CW_CERT_C;
3497                 }
3498
3499         if (s->state == SSL3_ST_CW_CERT_C)
3500                 {
3501                 s->state=SSL3_ST_CW_CERT_D;
3502                 ssl3_output_cert_chain(s,
3503                         (s->s3->tmp.cert_req == 2)?NULL:s->cert->key);
3504                 }
3505         /* SSL3_ST_CW_CERT_D */
3506         return ssl_do_write(s);
3507         }
3508
3509 #define has_bits(i,m)   (((i)&(m)) == (m))
3510
3511 int ssl3_check_cert_and_algorithm(SSL *s)
3512         {
3513         int i,idx;
3514         long alg_k,alg_a;
3515         EVP_PKEY *pkey=NULL;
3516         SESS_CERT *sc;
3517 #ifndef OPENSSL_NO_RSA
3518         RSA *rsa;
3519 #endif
3520 #ifndef OPENSSL_NO_DH
3521         DH *dh;
3522 #endif
3523
3524         alg_k=s->s3->tmp.new_cipher->algorithm_mkey;
3525         alg_a=s->s3->tmp.new_cipher->algorithm_auth;
3526
3527         /* we don't have a certificate */
3528         if ((alg_a & (SSL_aNULL|SSL_aKRB5)) || (alg_k & SSL_kPSK))
3529                 return(1);
3530
3531         sc=s->session->sess_cert;
3532         if (sc == NULL)
3533                 {
3534                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,ERR_R_INTERNAL_ERROR);
3535                 goto err;
3536                 }
3537
3538 #ifndef OPENSSL_NO_RSA
3539         rsa=s->session->sess_cert->peer_rsa_tmp;
3540 #endif
3541 #ifndef OPENSSL_NO_DH
3542         dh=s->session->sess_cert->peer_dh_tmp;
3543 #endif
3544
3545         /* This is the passed certificate */
3546
3547         idx=sc->peer_cert_type;
3548 #ifndef OPENSSL_NO_ECDH
3549         if (idx == SSL_PKEY_ECC)
3550                 {
3551                 if (ssl_check_srvr_ecc_cert_and_alg(sc->peer_pkeys[idx].x509,
3552                                                                 s) == 0)
3553                         { /* check failed */
3554                         SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_BAD_ECC_CERT);
3555                         goto f_err;
3556                         }
3557                 else
3558                         {
3559                         return 1;
3560                         }
3561                 }
3562         else if (alg_a & SSL_aECDSA)
3563                 {
3564                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_ECDSA_SIGNING_CERT);
3565                 goto f_err;
3566                 }
3567         else if (alg_k & (SSL_kECDHr|SSL_kECDHe))
3568                 {
3569                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_ECDH_CERT);
3570                 goto f_err;
3571                 }
3572 #endif
3573         pkey=X509_get_pubkey(sc->peer_pkeys[idx].x509);
3574         i=X509_certificate_type(sc->peer_pkeys[idx].x509,pkey);
3575         EVP_PKEY_free(pkey);
3576
3577
3578         /* Check that we have a certificate if we require one */
3579         if ((alg_a & SSL_aRSA) && !has_bits(i,EVP_PK_RSA|EVP_PKT_SIGN))
3580                 {
3581                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_RSA_SIGNING_CERT);
3582                 goto f_err;
3583                 }
3584 #ifndef OPENSSL_NO_DSA
3585         else if ((alg_a & SSL_aDSS) && !has_bits(i,EVP_PK_DSA|EVP_PKT_SIGN))
3586                 {
3587                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DSA_SIGNING_CERT);
3588                 goto f_err;
3589                 }
3590 #endif
3591 #ifndef OPENSSL_NO_RSA
3592         if ((alg_k & SSL_kRSA) &&
3593                 !(has_bits(i,EVP_PK_RSA|EVP_PKT_ENC) || (rsa != NULL)))
3594                 {
3595                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_RSA_ENCRYPTING_CERT);
3596                 goto f_err;
3597                 }
3598 #endif
3599 #ifndef OPENSSL_NO_DH
3600         if ((alg_k & SSL_kEDH) &&
3601                 !(has_bits(i,EVP_PK_DH|EVP_PKT_EXCH) || (dh != NULL)))
3602                 {
3603                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DH_KEY);
3604                 goto f_err;
3605                 }
3606         else if ((alg_k & SSL_kDHr) && !SSL_USE_SIGALGS(s) &&
3607                 !has_bits(i,EVP_PK_DH|EVP_PKS_RSA))
3608                 {
3609                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DH_RSA_CERT);
3610                 goto f_err;
3611                 }
3612 #ifndef OPENSSL_NO_DSA
3613         else if ((alg_k & SSL_kDHd) && !SSL_USE_SIGALGS(s) &&
3614                 !has_bits(i,EVP_PK_DH|EVP_PKS_DSA))
3615                 {
3616                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DH_DSA_CERT);
3617                 goto f_err;
3618                 }
3619 #endif
3620 #endif
3621
3622         if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) && !has_bits(i,EVP_PKT_EXP))
3623                 {
3624 #ifndef OPENSSL_NO_RSA
3625                 if (alg_k & SSL_kRSA)
3626                         {
3627                         if (rsa == NULL
3628                             || RSA_size(rsa)*8 > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher))
3629                                 {
3630                                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_EXPORT_TMP_RSA_KEY);
3631                                 goto f_err;
3632                                 }
3633                         }
3634                 else
3635 #endif
3636 #ifndef OPENSSL_NO_DH
3637                         if (alg_k & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
3638                             {
3639                             if (dh == NULL
3640                                 || DH_size(dh)*8 > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher))
3641                                 {
3642                                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_EXPORT_TMP_DH_KEY);
3643                                 goto f_err;
3644                                 }
3645                         }
3646                 else
3647 #endif
3648                         {
3649                         SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE);
3650                         goto f_err;
3651                         }
3652                 }
3653         return(1);
3654 f_err:
3655         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
3656 err:
3657         return(0);
3658         }
3659
3660 #if !defined(OPENSSL_NO_TLSEXT) && !defined(OPENSSL_NO_NEXTPROTONEG)
3661 int ssl3_send_next_proto(SSL *s)
3662         {
3663         unsigned int len, padding_len;
3664         unsigned char *d;
3665
3666         if (s->state == SSL3_ST_CW_NEXT_PROTO_A)
3667                 {
3668                 len = s->next_proto_negotiated_len;
3669                 padding_len = 32 - ((len + 2) % 32);
3670                 d = (unsigned char *)s->init_buf->data;
3671                 d[4] = len;
3672                 memcpy(d + 5, s->next_proto_negotiated, len);
3673                 d[5 + len] = padding_len;
3674                 memset(d + 6 + len, 0, padding_len);
3675                 *(d++)=SSL3_MT_NEXT_PROTO;
3676                 l2n3(2 + len + padding_len, d);
3677                 s->state = SSL3_ST_CW_NEXT_PROTO_B;
3678                 s->init_num = 4 + 2 + len + padding_len;
3679                 s->init_off = 0;
3680                 }
3681
3682         return ssl3_do_write(s, SSL3_RT_HANDSHAKE);
3683 }
3684 #endif  /* !OPENSSL_NO_TLSEXT && !OPENSSL_NO_NEXTPROTONEG */
3685
3686 /* Check to see if handshake is full or resumed. Usually this is just a
3687  * case of checking to see if a cache hit has occurred. In the case of
3688  * session tickets we have to check the next message to be sure.
3689  */
3690
3691 #ifndef OPENSSL_NO_TLSEXT
3692 int ssl3_check_finished(SSL *s)
3693         {
3694         int ok;
3695         long n;
3696
3697         /* If we have no ticket it cannot be a resumed session. */
3698         if (!s->session->tlsext_tick)
3699                 return 1;
3700         /* this function is called when we really expect a Certificate
3701          * message, so permit appropriate message length */
3702         n=s->method->ssl_get_message(s,
3703                 SSL3_ST_CR_CERT_A,
3704                 SSL3_ST_CR_CERT_B,
3705                 -1,
3706                 s->max_cert_list,
3707                 &ok);
3708         if (!ok) return((int)n);
3709         s->s3->tmp.reuse_message = 1;
3710
3711         if ((s->s3->tmp.message_type == SSL3_MT_FINISHED)
3712                 || (s->s3->tmp.message_type == SSL3_MT_NEWSESSION_TICKET))
3713                 return 2;
3714
3715         return 1;
3716         }
3717 #endif
3718
3719 int ssl_do_client_cert_cb(SSL *s, X509 **px509, EVP_PKEY **ppkey)
3720         {
3721         int i = 0;
3722 #ifndef OPENSSL_NO_ENGINE
3723         if (s->ctx->client_cert_engine)
3724                 {
3725                 i = ENGINE_load_ssl_client_cert(s->ctx->client_cert_engine, s,
3726                                                 SSL_get_client_CA_list(s),
3727                                                 px509, ppkey, NULL, NULL, NULL);
3728                 if (i != 0)
3729                         return i;
3730                 }
3731 #endif
3732         if (s->ctx->client_cert_cb)
3733                 i = s->ctx->client_cert_cb(s,px509,ppkey);
3734         return i;
3735         }
3736